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Philips Sonicare DiamondClean Smart Review

Medically Reviewed By: Dr. Gemma Wheeler

(GDC Number: 259369)

Philips Sonicare DiamondClean Smart

Our Verdict

A superb electric toothbrush. There are lots of things to like about this DiamaondClean Smart.

If you are not limited by budget, the is the brush to go for.

However, the vast majority will gain better value for money other brushes we recommend.


  • Built-in timer and pacer
  • Pressure sensor
  • Design
  • Bluetooth & AI technology
  • Travel case
  • Battery life
  • BrushSync technology


  • Bluetooth & AI technology
  • No smartphone stand or holder
  • Expensive

The 3 BIG questions about the Sonicare DiamondClean Smart

If you are short of time, the answers to the following 3 questions should let you know all you need to about the Sonicare DiamondClean Smart electric toothbrush.  If we have missed something, let us know in the comments.

If you want more detail, you can read the full Sonicare DiamondClean Smart review further down the page or watch our video review.

1. Is there anything drastically wrong with this toothbrush?

We have given a rating of 5/5 to the DiamondClean Smart.

Performance and daily use of this brush are fantastic, it really sets the bar high and shows what is possible with neat innovative touches. We rate it as the best smart toothbrush.

The problem here is predominantly price.

Sadly, the ticket price is eye watering.  You can get brushes that provide equally good cleaning for a fraction of the DiamondClean Smart.

Yes, you may forgo features but you will likely rest easier with less money spent on other toothbrushes.

However, if you can justify the spend you really will enjoy what is on offer with the Sonicare DiamondClean Smart.

2. Which other brushes should I consider?

If you can afford it, the DiamondClean Smart is one very special toothbrush that gets our recommendation.

For the sake of your bank account more than any other reason, we encourage you to consider alternatives.

The Genius 9000 from Oral-B is a premium smart toothbrush that is much more cost effective.

If you want a sonic toothbrush but are not interested in real-time tracking and smart technology then the Sonicare ProtectiveClean 4300 is a great choice.

Both alternatives are less than half the price and by no means are you giving up half the features as a result.

For a more detailed comparison of buying options, see our list of recommended brushes.

3. Where is the best place to buy the DiamondClean Smart?

As the most expensive brush in the Sonicare range, not all retailers will stock this model, but a large number still do.

You can purchase from Philips themselves, Tangs, Harvey Norman, Shopee and Lazada.

Why should you listen to us?

Electric Teeth is an independent website with a mission to simplify dental health.

Our team is a mixture of consumers and dental professionals.

We strive to create honest, informative content, telling you the facts, good or bad.

We are not sponsored by big brands or healthcare companies. Our site is funded by affiliate revenue and ads, but we only recommend products that we have tested and truly believe to be worth your money.

Why not watch this short video to find out all about us?

Video Review

The following video is of the UK version of the DiamondClean Smart. There are subtle box contents and price differences, but the general message is the same.

Philips Sonicare DiamondClean Smart Review [UK]

And now for a bit more detail….

It was Oral-B who really kicked off the ‘smart’ and ‘connected’ electric toothbrush game.  It has taken a few years to gain traction but today there is a bigger demand for such.

Sonicare began to take up the fight with Oral-B, launching the FlexCare Platinum Connected.  Whilst the FlexCare Platinum Connected was an absolutely fantastic piece of kit, it lacked the finer detail and finishing touches of the DiamondClean series.

But do we now have the solution to this problem? The DiamondClean Smart.

Variants of this toothbrush

Within Singapore, there is just 1 version of the DiamondClean Smart.

It is the HX9924/46.

But I want to make you aware that globally there are many different versions of the DiamondClean Smart.

This applies to quite a few toothbrushes, but the DiamondClean Smart in particular has many different varaints that may be offered to you for sale.

The features, box contents and price can differ.

Just know that it is the HX9924/46 that you want to look for.

What’s in the box?

  • 1 x Philips Sonicare DiamondClean Smart rechargeable toothbrush (HX9244/14)
  • 4 x Brush heads (1 x C3 Premium Plaque Control, 1 x G3 Premium Gum Care, 1 x W3 Premium White and 1 x T1 TongueCare+ tongue brush)
  • 1 x Charging glass
  • 1 x Travel case
  • Documentation

Please note: Images used in this review are for illustration purposes. The colour of the handle will be different when purchased in Singapore.

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Key Features

  • Sonic cleaning action
  • 5 different cleaning modes
  • 3 power intensity settings
  • Bluetooth connectivity
  • Pressure sensor
  • Brush head recognition system
  • Built-in rechargeable battery
  • 3 week battery life
  • 2 minute timer
  • 20 second pacer
  • Automatic power off

Pro & Cons

Here are what I consider to be the pros and cons of the Sonicare DIamondClean Smart.

The Positives

  • 5 cleaning modes – Excellent modes engineered to help you achieve the best oral health you can.
  • Battery life – An impressive 3 weeks of battery life is available from the fully charged Lithium-Ion battery and it is simple and easy to charge.
  • Travel case – Great for protection when being transported, the addition of in the case charging via USB is a real bonus for the more connected traveller.
  • Automatic power off – It is a very simple yet effective means of conserving battery power that psychologically saves more effort than you think.
  • Brush head detection – Not a feature you need, but so useful and just makes for a fantastic overall experience.
  • Intensity settings – Control the power delivered by the brush motor.
  • Pressure sensor – The first Sonicare to offer a visible pressure sensor.
  • Connectivity – The app is lightweight and not overbearing. It is fairly accurate with the tracking and provides guidance on where to brush.
  • Timer and pacer – Be encouraged to brush for the dentist recommended time.
  • BrushSync technology – The brush will alert you when it is time to replace the brush head, whilst also setting the correct cleaning mode for the head.

The Negatives

  • Price – The suggested retail price and what it is actually selling for are too high to make this a justifiable purchase for many.
  • Connectivity – The app requires a commitment to make use of it. Also tracking not perfect.
  • Smartphone stand or holder – Considering this is a connected brush you are not encouraged to get your smartphone out and really use the app.

Design, usability, clean & general use

First things first, let me talk about the design of the brush, how it looks, how it feels.

Smart and stylish this brush most certainly is.  It is clearly part of the DiamondClean range with the aesthetics that are present here, there is a continuity.

Globally there are a few different colour options, but locally it is just the Grey colour available. It is nice. A little different.

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There is a smooth premium finish to the brush handle.  It is hard to explain what it actually feels like.  It is not like a glossy hard plastic. Of course, it is a solid construction but it feels more premium than most other brushes.

On the front of the brush handle, on towards the top is the Philips Sonicare logo in a dark grey colour.

Below this (about two thirds of the way up the handle) is the main power button.

It is of a concave design and the thumb sits comfortably into it.  There is a large power icon on it.

It is not as resistive as some power buttons nor does it give the same level of feedback.  You can of course tell when you have turned the brush on or off.

Below this button are 3 lights, that increase in size left to right.  It looks a little like a phone signal might on your smartphone screen.  Each light represents the intensity setting of the brush.  1 light, the brush is set to low intensity, 2 lights, medium intensity and all 3 well you are rocking on full power brushing intensity.

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Another concave button sits below this light feature. This is the mode/intensity button.  You press this to change between the 5 cleaning modes or change those 3 levels of brushing intensity.

Getting towards the bottom of the handle now, the names of the available cleaning modes are built into the handle.  Each one lights up when selected.  They do not all light up at the same time.

The light that shines out from these cleaning modes and intensity icons is a white light.

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Below this is the brush head replacement reminder and the battery icon.

The brush head icon will illuminate and pulse when it is time to change the brush head for a new one (normally at 3 months).  It is a good visual reminder.  This works in conjunction with the smart chip built into the brush head to know when to remind you.

At the base of the brush is the LED light ring or the pressure sensor indicator.  I will explain this in a bit more detail later in the review.  But when activated it lights up a nice purple colour.

The base of the brush is flat with no recess for a charging pin.

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The remainder of the rounded square handle is smooth to the touch with no additional icons, grips or features to speak of.

Right at the top of the brush handle, just under where the brush head connects is a ring.  This is a dark grey/black colour, it contrasts the brush handle slightly.

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I will talk more about the brush heads later, but they are black in colour too rather than the more typical white plastic.  These complement the brush handle well.  There is not the harsher contrast of grey and white.

In hand the brush feels weighty, solid and robust, you can feel some of the price is built into the handle.

Of course there is a lot of clever technology built into that handle that we can’t see.

I know it is not particularly pretty, but a few extra grips on this handle would be nice.

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It’s a balance between design and practicality, but when wet this brush is most likely going to be a little more slippery than an Oral-B model that has more rubber grips and naturally resists the slip from the hand better.  Those with limited grip or movement in fingers and wrist might find the DiamondClean Smart a little more tricky to handle.

Now the whole reason for investing in an electric toothbrush is to clean your teeth.  And Sonicare does a good job of this too.

Studies have suggested that Oral-B’s oscillating, rotating and pulsating heads offer better overall cleaning performance.  But there is also plenty of supporting evidence to show how Sonicare does an equally good job.

Sonicare brush heads tend to be a bit larger, so may when compared to Oral-B’s rounded heads feel like they cannot reach as deep into the mouth and into tighter gaps.

It is clinical debate over which is better ultimately, but at the end of the day, there are many benefits to an electric toothbrush.

My personal preference is for the Oral-B style, they feel a bit more aggressive on the teeth and gums, which I like. Sonicare is a softer experience in my mind.

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You get 4 styles of brush head included with the DiamondClean Smart.

These are:

  • 1 x Philips Sonicare C3 Premium Plaque Control Toothbrush Head
  • 1 x Philips Sonicare G3 Premium Gum Care Toothbrush Head
  • 1 x Philips Sonicare W3 Premium White Toothbrush Head
  • 1 x Philips Sonicare T1 TongueCare+  Toothbrush Head

There is something special about these brush heads though.

Yes, they have been scientifically engineered with the bristles to be the right length and angle, the black coloured plastic compliments the brush handle superbly well, but equally as clever is the fact that these brush heads are smart.

Or, to be more technically correct, they are Brushsync enabled.

There are 2 parts to this technology (mode pairing and replacement reminder) that are only functional thanks to little RFID chips are built into each brush head.

When connected to the DiamondClean Smart brush handle (or other Brushsync enabled handle) the brush will automatically be set to the most appropriate cleaning mode for that brush head.

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Those cleaning modes are:

  • Clean
    • Clean lasts for 2 minutes and designed to be used with intensity level 3. It gives a thorough and complete clean.  It is recommended that you use the Premium Plaque Defense brush head with this mode.  This is the mode most will use on a daily basis.
  • White+
    • White+ lasts for 2 minutes and 40 seconds and is designed to be used with intensity level 3.  The best brush head to use is the Premium White brush head.
  • Gum Health
    • Gum Health lasts for 3 minutes and 20 seconds and is designed to be used with intensity level 3.  The best brush head to use is the Premium Gum Care brush head.
  • DeepClean+
    • The amount of time DeepClean+ runs for depends on whether or not the handle is connected to the app. In connected mode, DeepClean+ runs for 2 minutes and provides BrushPacer feedback every 20 seconds. In non-connected mode, DeepClean+ runs for three minutes and provides BrushPacer feedback every 30 seconds.
  • Tongue Care
    • Tongue Care lasts for just 20 seconds and is to be used with intensity level 1 and the Tongue Care+ brush head.

You may wish to consult the instruction book that comes with the brush for a step by step guide on how to make best use of each of these modes.

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So, fit the Tongue Care brush head and the brush will know to operate the Tongue Care mode.

Replace with the Plaque Control brush head and the brush will change to the Clean mode.

You can manually change what mode is used with each brush head and what intensity setting you want, but the brush is clever enough to know and preset some settings for you.

To change the cleaning mode used, whilst the brush is off, press the mode/intensity button the correct number of times until the desired mode is selected.

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When the brush is powered on that button can be used to change the intensity of the brush.  The cleaning mode can be changed only when the brush is powered off.

The brush will remember the last cleaning mode used if the brush automatically powers off at the end of the cleaning cycle. So if clean was the last mode used and the brush turned itself off, it will launch into this when powered on, if the brush head has not been changed.

Now, these super smart brush heads are very cool.  It is a neat touch and something we have thought brushes available today should be able to do.

They go one stage further and work in conjunction with the brush to light up a brush head reminder icon (when appropriate) to give you a visual clue it is time to replace the brush head.  Very clever.  It knows how long each head has been used for because of the chip.

All too often people use brush heads for longer than they are designed to be used for, potentially doing damage to the teeth and gums.  This brush head replacement reminder helps avoid this issue.  You will need this smart brush head to ensure this feature works.

You can tell if it is a smart brush head by the icon towards the bottom of the brush head, it looks like a WiFi logo.

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There is a problem though.  This innovation comes at a cost.  S$60 for a pack of 4 brush heads!  That is S$15 each.  This is a whole new pricing category!  However, given the price of the brush itself, it is about right!

You can use standard Sonicare brush heads (cheaper, but still expensive) on the DiamondClean Smart, but the brush will not automatically change cleaning modes, it will also not tell you when it is time to change brush head.

Most of the other brush heads are finished in white plastics, which do not fit quite so well with the colour scheme, but the benefit is a cost saving.

Smart brush heads like these will also not offer any smart functionality on any other brush other than the DiamondClean Smart, unless that brush has BrushSync technology.

If you want to consider your options, check out our ultimate guide to Sonicare brush heads.

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All Sonicare brush heads (with exception of tongue clean) have reminder bristles that are the blue in colour, which over a typical 3 month period will fade from a relatively strong blue to white colour.  If they turn white, replace the head.  This is another visual clue if the flashing light on the handle doesn’t do it for you.

Inside of the handle is the battery, the motor and all the electronic gadgetry that makes this brush as smart as it is.

There is a whole section in this review dedicated to the battery life, but to touch on it for a moment, inside the handle is a Lithium-Ion battery that lasts up to 3 weeks.

Sonicare has always been good when it comes to battery performance and really set the standard.

One way in which they conserve power is by having the brush automatically turn off at the end of each cleaning cycle.  Whilst this is power conserving, to me, this is also a fantastic feature in that it clearly tells you when the clean is over.

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This functionality ties in with the built-in timer that is in the brush.  At 20 second intervals, you get a notification via a beep, a pause in the motor and brush head motion that it is time to change area and focus on cleaning the next section of the mouth.

You get 6 x 20 second intervals per 2 minute clean, so you focus on the following areas:

  • Upper right back teeth
  • Upper front teeth
  • Upper left back teeth
  • Lower left back teeth
  • Lower front teeth
  • Lower right back teeth

These timings are all based on professional recommendations and most modes last for 2 minutes.

As important as the brush, is the way in which you clean your teeth.  Sonicare goes to quite some detail in the manual about how to clean your teeth properly.

Sealed inside are all the electronics, which means that this brush is water resistant.  You can rinse it under the tap and it will survive a life a bathroom.  Sonicare does not advise use in the shower and you should not submerge the brush in water.

Part of the ethos behind this brush, particularly the smartphone app is about education – encouraging and advising to clean better.  It is not a lecture on what’s right and wrong, but tips and diagrams to show you how to be better and improve over time.

One feature that helps with this is the pressure sensor.  Built into the brush, when the sensor detects when too much pressure is applied to the teeth it reduces the speed of the brush motor and the light ring on the bottom of the brush handle lights up to emit a purple light.  It will remain purple until such time as the pressure is released.

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The bristles need only skim the teeth.  Too much pressure can be damaging.

If you use the smartphone app it will show on screen too.

As pretty as the light is, you do not want it to come on.

Some might argue the purple light is a bit of a feminine colour, there is no option to change it.

I like the principle of how it is implemented, it looks smart without detracting from the design.  However, unless in a dark room the light is actually not that obvious.  You may see it if brushing in front of a mirror, but I think Oral-B’s neck placement is more obvious, not to mention brighter.

It would be nice if there were some of the customisation options like there is with the Oral-B Genius LED Smart Ring.

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Part of the reason multiple cleaning modes exist is that we are all different.  We have different needs and preferences.  Some might have particularly sensitive teeth and gums whilst others have particular goals, to whiten the teeth for example.

The DiamondClean Smart gives you the option to choose between 3 different intensity levels: low, medium and high. Based on the brush head you attach, the intensity will be selected automatically.  If you wish to change to a different intensity, you can do so by pressing the mode/intensity button while brushing.

Easy-start is an option that gently increases the power over the first 14 brushings to help you get used to the brushing with the Philips Sonicare DiamondClean Smart.

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The Easystart feature works in all modes other than TongueCare+ mode.

The brush comes with the mode deactivated, but it can be turned on. Refer to our FAQ’s for details on this process.

There is then of course one of the main reasons for opting for the ‘Smart’ DiamondClean, the app.

Available for iOS or Android, the Sonicare app can be downloaded and installed onto your smartphone.  It uses Bluetooth to connect to the brush and synchronise data.

This is the ‘Smart’ element really coming into play.

To get the best value and functionality from the brush, you need to use the app at the same time as you brush your teeth.

This will allow you to see in real-time how well, or not, you are brushing.

Via an on-screen graphic of the teeth in your mouth, the app guides you around the sections of the mouth you need to brush.

The theory is that you clean the teeth evenly when you follow this.

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The teeth turn from a dull colour to a bright white as you brush. The longer you brush the whiter they get. Areas that get insufficient brushing time remain dull.

Although it is best to follow the graphic on screen, you can clean the teeth in any order you see fit and the app will acknowledge the position of the brush and change the colour of the teeth on-screen accordingly. Whilst its not always 100% accurate it is fairly good most of the time.

At the end of the brushing session, areas of the mouth you missed or did not give enough attention to are coloured yellow.

Essentially, the colour changing teeth allow you to really easily see how well you are doing and make improvements straight away, because you are being shown where to pay more attention.

If you don’t use the app when you brush, you won’t get the same level of real-time feedback. However, it will sync data when the 2 are next connected. It stores up to 28 brushing sessions of data.

The app has recently been updated and presents a summarised view of your brushing data for the last 7 days. This is a positive because there is less opportunity to become overwhelmed by all the data.

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You can dig further down into the app for a bit more historic data if you want it, but you don’t get as much historic data (months & years) as you once did.

The main progress screen shows the average time per session and per day. It also shows the pressure levels used.

Green icons are good. Orange icons highlight areas you need to work on.

This information is helpful for sure, particularly for new electric toothbrush users.

Within the app, it gives you details about the brush heads you have been using. It will log each one and show how many brushing sessions you have left.

You can within your profile set details about yourself. You can also get more information about your particular brush handle, as well as update the software that your brush handle is using.

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Sonicare I think have done an ok job with the app. Initial setup and configuration are straightforward and I had no issues pairing the app with the brush. That said there is room for improvement. I think bringing back more data logging would be useful.

In an ideal world, we would like to see the ability for more people to share a brush handle between users (changing the brush head of course) to get more value from it.  Whilst possible, sadly the Bluetooth connectivity option becomes redundant.  This brush can pair with multiple phones but is only capable of logging one set of data.  There is no way to differentiate between users.  The handles see’s any brushing session as that of the main user.  Thus sharing the DiamondClean Smart handle will defeat the very point of the brush.

I am sure in time there will be a solution to this, but presently there is not.

If you have any question over the value of the app, the DiamondClean Smart is not really for you.

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One of the biggest oversights with the Smart is that in the box there is no smartphone holder.

I am not suggesting a bit bulky suction cup affair as per the Oral-B Genius 9000, but some neat cradle that a phone could sit on whilst you are brushing, to hold the phone up at an angle that you can view the screen and keep a hand free.  It would cost just a few dollars to include and finish the package.

Sadly instead you will either need to hold the phone in hand to see what’s going on in the app and track your performance or fashion your own stand.

As for other in box extras, aside from the handle and the brush heads, you get a travel case and charging glass.

The charging glass is the same as the second generation DiamondClean’s charging glass.  Think of a glass tumbler you might have a drink of spirits like a Brandy or Whiskey from.  Put the Sonicare logo on the front of it and sit it on a plate that has a power connector attached to it and you get the idea.

Lent in the glass, the brush does not stand upright.

The power connector is a 100-240v 2 pin connector.  If you want to connect to a 3 pin mains socket you will need to invest in an adapter.  The good news here is that it supports international voltages if travelling.

However, the smartest or coolest way to charge is in my opinion through the travel case.

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Without doubt, the best travel case I have experienced to date for a toothbrush, the hard case is finished in a soft touch leather.

Robust, it will certainly take some knocks and can hold the handle and up to 2 brush heads.

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A magnetic closure keeps the lid shut, not fiddly clasps or buttons, but easy enough to open too. It looks and feels every part as premium as the brush.

A charging cable (which is 60cm in length) is actually built into the case and tucks away underneath it.  On the standard DiamondClean it is a detachable cable, that could easily be lost.

On the underside of the case, you remove a large panel to reveal the cable neatly nestled within the case.  With one end firmly wired into the case, at the other end is a standard USB Type A connection that can be connected to a USB port on a computer, on a wall charger, to a battery bank and more, to charge the brush where you like whilst in the case. I love this, despite the fact you need not charge the brush all that often with a 3 week battery life.

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The cover that hides the cable has been cleverly designed and can actually be refitted whilst allowing the cable to be fed out through the back.

Given the price, including a USB power adapter for a mains connection would have been a nice touch.

Finally for this section, for added peace of mind the DiamondClean Smart comes with a 2 year warranty.

Summary of design, usability, clean & general use

  • Slim and stylish brush handle with a solid build
  • Minimalist design, potentially could do with more grip points
  • Cleans the teeth very well
  • 5 cleaning modes, shown on brush handle via white light
  • 3 power intensity settings
  • 4 brush heads included
  • Smart brush heads that automatically change the cleaning mode – Expensive
  • Alternative brush heads available
  • Brush head reminder
  • Built-in 20 second pacer and 2 minute timer tells you when to change quadrant and finish brushing
  • Automatically powers off at the end of the cleaning cycle
  • Good battery life – 3 weeks
  • Easy-start function
  • Pressure sensor with LED although light is set to purple and not that bright
  • Bluetooth connectivity with logging and live tracking of clean
  • Smart charging glass supporting 100-240v
  • Great travel case
  • Lacks a smartphone stand or holder
  • 2 year warranty as standard

Battery life

Sonicare always do a top job when it comes to battery life, they have for a long time set the standard.

I would like to say that this DiamondClean Smart is no exception, but the box states a 2 week battery life.

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There is a reason why.

Most brands and here at Electric Teeth quote battery life based on the performance of the default ‘clean’ mode.

In my hands on testing, I managed some 50 cleaning sessions on the standard ‘Clean’ mode with the intensity set to high.  That’s 100 minutes of usage time or 25 days (over 3 weeks), thus living up to the standards previously set by Sonicare.

However, the Gum Health cleaning mode lasts just under twice as long as the standard clean mode, thus reducing the battery life to just 2 weeks.

Whilst Sonicare are actually quoting the worst battery life you might get from the brush, I think they are underselling themselves a bit here.

Unless you decide to always use the longest cleaning sessions you will get anywhere between 14-25 days usage out of this brush.

The DiamondClean has a Lithium-Ion battery, the same sort that you have in your smartphone.  This type of battery lasts and performs better than older battery technology like Nickel Metal Hydride (NiMh).

The automatic power off facility helps to conserve power, by turning the brush off at the end of each clean.

When the battery power is getting low, approximately 10% or less, the battery indicator lights up an amber/yellow colour rather than white.

When the battery is completely flat the brush will beep 6 times and will not power on.

Unless you are a frequent traveller, you will likely leave your brush at home.  It is quite safe to leave it on the charger at all times, but with such a long battery life you do not need to, you could pack it away.

The DiamondClean Smart has 2 ways in which it can be charged. Via the charging glass or the travel case.

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Charging glass may sound strange but that is what it is.  Like a small tumbler, you might have a stiff drink from, the Sonicare branded glass sits on a plate, which in turn connects to the mains power supply.

The brush sits in the glass at an angle, not upright like most others and uses the wonder that is inductive charging to replenish the internal battery.

The charging indicator on the brush handle flashes white until the DiamondClean Smart toothbrush is fully charged.

It takes at least 24 hours to fully charge your Philips Sonicare. You do not have to fully charge your handle before first use, as the handle is precharged for first use. However, it is recommended to fully charge it after first use.

This charging time is longer than most other brushes, but then the battery life is quite a bit longer.  Given that you don’t always need to access it, no big deal in my mind.

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The travel case is innovative, it is an accessory that is included with the DiamondClean, but with the Smart model we have here, an improvement has been made that rather than a detachable USB cable as before, this is now built-in.

At the other end of the cable is a full sized USB Type A connector.

When not in use this tucks away under the case.

With the brush handle in the case, you can now charge it but connecting the charging travel case to a laptop, a wall-mounted USB socket or a suitable wall adapter.

There is no battery in the travel case itself.

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The charging glass comes with a 100-240v power adapter.  As a 2 pin configuration, You will need a plug adapter.

Summary of battery life

  • Up to 100 minutes of usage time or 25 days usage based on 2 cleans a day
  • A charging glass included in the box
  • A travel case capable of charging the brush included too
  • Battery icon flashes amber/yellow when 10% or less
  • Brush beeps 6 times when no power left
  • Takes up to 24 hours to charge fully
  • The battery status light flashes until fully charged
  • Works on 100-240 volts

Price & where to buy

I have included links to buying options here at the start of the review.

In the section below, I discuss the price more generally and in relation to similar products.

Almost all electric toothbrushes start out with a Recommended Retail Price (RRP) that is far above what they actually sell for.

Oral-B are well known for being available at 25% or less below RRP from day one that it goes on sale.

Sonicare does tend to discount, but not to quite the same degree, with Philips often being seen as the more premium brand with higher ticket prices.  

I commend Sonicare for not discounting as Oral-B do, there is value in retaining a premium price; after all many of their brushes are finished better, but the feature for dollar value can be harder to justify.

The DiamondClean Smart matches the retail price of the Oral-B 9000 with an RRP of S$399.

Where the Genius 9000 is selling for around S$175, the Smart is still selling around S$360. That means it is a saving of just 10%.

The lowest price I have seen it sold for is S$330 which is then just a 20% discount compared to the nearly 50% of the Oral-B.

Philips Sonicare DiamondClean Smart Review 29

So, to the brush heads then, well are you ready….a pack of 4 of admittedly ‘smart’ brush heads, S$60!  That is S$15 per brush head.

A single pack of heads is more expensive than some really good entry level electric brushes.

The way we usually calculate the cost of a brush here at Electric Teeth is over 3 years.  Many brushes will last longer, but it gives a baseline against which to compare by.

Whilst there are 4 brush heads in the box the TongueCare brush is not an everyday option.

Therefore you are going to need to buy at least another 9 over this time.

9 brush heads at S$15 per time add on the $135 cost. You have a grand total of S$495.  That is a cool S$0.45 per day to own.

Had or if the brush was only available at the RRP, then the total bill will be S$534 of S$0.49 per day.

These prices exclude the cost of water, toothpaste and electric to charge it, but you get a rough idea.

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As much as I love what this brush has to offer, and understand the need to pay for quality and innovation, this is one bitter pill to swallow, even if you are more comfortable financially.  I believe the DiamondClean Smart will be more about justifying a want than a need.

Oral-B’s Genius 9000 is basically half the price at S$0.22 per day.

I would say you could extend the value of this brush by sharing with others, which you can. BUT there is a massive caveat in that the tracking only works for one user.  Given that so much of this brush is geared around the smart tracking facilities it defeats the point.

It is not for me to tell you how to spend your money.  If you like the Sonicare DiamondClean Smart and can justify the price, go for it.  For your own sake, shop around or consider if this is really the brush for you.

Please note that all prices quoted are approximates and will vary based on location, supplier and time of purchase.  These figures were correct at the time of writing and should not be relied upon as hard fact, but used as a guide during your decision process.

Summary of price & where to buy

  • Recommended retail price of S$399
  • Sells for around S$360
  • Brush heads typically available for S$60 per pack of 4 or S$15 each
  • Works out at around S$0.49 per day over 3 years
  • Great brush, but consider the alternatives this is a big price to pay
  • Oral-B Genius 9000 costs $0.22 per day

Reliability & long term use

Sonicare is a brand that I have trust in when it comes to reliability.

There is a certain something about their products that you can only really feel and understand when in the hand.

Materials feel more premium, the edges slightly more refined and features slightly more polished.

It is all very well having lots of bells and whistles but if everyday usability, practicality and performance doesn’t match up then things are not great.

The DiamondClean Smart does not leave me questioning my respect for Sonicare.

Solid in hand, it looks and feels the part.

Philips Sonicare DiamondClean Smart Review 4

Here at Electric Teeth, we test the electric toothbrushes in a way that you would use it at home.

Whilst the odd knock or tumble may occur we are not putting the brush through extensive durability or stress tests.

We have tested every toothbrush we write about because that is the only way we can be so honest and direct about the points we make.

To date, I have not experienced any issues with the brush and see few weaknesses.  The biggest weakness is likely the user, you or I actually making full use of what is on offer here.

Should the worst happen and the brush fail, then it is backed by a 2 year warranty.  

Do be aware that the Sonicare DiamondClean Smart is water resistant so it can get wet and be wiped down with water but it is not waterproof so where possible avoid prolonged exposure to water to avoid doing damage.  Philips explicitly state in the user manual that it should not be used in the shower or bath.  Perhaps more caution than anything, but best not test it!


I cannot deny that this is one super impressive electric toothbrush.  I am inclined to say this is one of, if not the best I have ever used.

It looks great, it has all the neat features and functions that make day to deal cleaning and usability great.

Battery life is right up there, the clean is good, the build quality is superb and I am certainly happy when using it.

I very much doubt that your 80 year old grandparents are going to be rushing out to buy this brush.

The target market is most certainly those who like technology, want the best and have a generous disposable income.

Whilst most suitable for many individuals, sadly for young and old the eye watering price is what holds this brush back.

For a quarter of the price you can have a capable equivalent, for half the price you can excellent alternatives, notably the Oral-B Genius 9000.

The DiamondClean Smart has to be something you REALLY want or can REALLY afford to justify this.

S$200 is a price that would sit considerably more comfortably with me, but I guess you have to pay for innovation and nigh on perfection?!

Electric Teeth Rating

Philips Sonicare DiamondClean Smart Review 32

Size Guide

  • Height (without head) – 19cm
  • Height (with head) – 25.5cm
  • Width – 2.7cm
  • Thickness – 3cm
  • Weight (without head) – 137g
  • Weight (with head) – 142g

All are approximates


  • Is the Sonicare DiamondClean Smart an oscillating brush?
    • No, it is not.
  • How many brushing modes does the Sonicare DiamondClean Smart have?
    • This brush offers 5 different cleaning modes.
    • There are Clean, White+, Deep Clean+, Gum Health and Tongue Care.
  • What brush head does it come with and what alternative ones can be used?
    • Supplied with the brush is 1 x Premium Plaque Control, 1 x Premium Gum Care, 1 x Premium White and 1 x TongueCare+ tongue brush head.
    • Any other Sonicare brush heads can be used on the brush, BUT the brush head detection will not function as the heads supplied with the DiamondClean Smart have specially built in chips to allow this to work.
    • Sonicare compatible heads include DiamondClean, ProResults, ProResults Gum Health, Sensitive and InterCare.
  • Does the Sonicare DiamondClean have a pressure sensor?
    • Yes, it does.
  • Does the Sonicare DiamondClean Smart have Bluetooth?
    • Yes, it does.
  • Does the Sonicare DiamondClean Smart come with a warranty & how long is it?
    • Yes, it does.  The warranty is for 2 years.
  • Does the DiamondClean Smart have a built in timer?
    • Yes.  At the end of a 2 minute cycle, the brush automatically turns off signalling the end of the cleaning time.  If you want to extend your clean, you will have to power the brush back on. It does also have a 20 second pacer.  At 20 second intervals a slight pause in the brushing mode to tell you to change quadrants.  There are 6 sections to the mouth.
  • How long does the battery last?
    • The battery lasts up to 100 minutes, which is equivalent to over 3 weeks or 25 days of usage based on 2 x 2 minute cleans per day.
  • Does it come with a charger?
    • Yes, a charging station is included with the toothbrush along with a travel case which can also charge the brush.
  • Can this be fixed to a wall?
    • The charging station has not been designed to be fixed to a wall.
  • Can I use the Sonicare DiamondClean Smart in the shower?
    • No, the manual specifically states not to use the DiamondClean in the shower or bath.
  • Does it come with a travel case?
    • Yes.  The DiamondClean Smart comes with a hard travel case that holds the brush and up to 2 brush heads.
  • How to change Sonicare DiamondClean Smart toothbrush cleaning mode?
    • The Philips Sonicare DiamondClean Smart is equipped with a second mode selector button.
    • First, make sure the toothbrush is turned off
    • Press the modes button to change modes
    • Find your preferred mode and put the toothbrush in your mouth
    • Turn on your Philips Sonicare DiamondClean Smart to start brushing in the selected mode
    • Your Philips Sonicare DiamondClean Smart will store your preferences for the next brushing session.
  • How to disable the Philips Sonicare DiamondClean Smart brush head reminders?
    • Place the handle in the charger
    • Press and hold the mode selector button
    • Press the power button three times whilst holding the mode selector button
    • Release all buttons
    • The reminder should now be disabled
  • What is brush head mode pairing?
    • A microchip in your brush head tells your DiamondClean Smart which one you’re using. So if you click on a gum-care brush head, for example, your toothbrush knows to select the optimal mode and intensity for that brush head. All you need to do is to press the power button.
  • Will other brush heads fit my Philips Sonicare DiamondClean Smart toothbrush?
    • All Philips Sonicare electric toothbrush brush heads that snap on will fit your DiamondClean Smart toothbrush. However, not all can be used for Smart mode pairing.  For smart mode pairing, you need only those with the smart brush head icon (looks like a wifi signal) at the base of the brush head.
    • A microchip in the Philips Sonicare Smart brush head tells your DiamondClean Smart which one you’re using. So if you click on a gum-care brush head, for example, your toothbrush knows to select the optimal mode and intensity for that brush head.
  • Do I always need to brush with the Philips Sonicare app?
    • The brush can store up to about 28 brushing sessions of data.
    • To avoid losing any data, download the Philips Sonicare app and sync your handle by connecting your toothbrush to the app. You will see that your data will be automatically uploaded to your progress report and the activity-tracking feature.
  • Can I activate or deactivate the pressure sensor?
    • Place the handle, with a brush head attached, in the plugged-in charger.
    • The pressure sensor is enabled by holding the mode/intensity button and by pressing the power button twice while on a charger. The handle will beep twice to confirm it is enabled.
    • The pressure sensor is disabled by holding the mode/intensity button and by pressing the power button twice while on a charger. The handle will beep once to confirm it is disabled.
  • How do I activate or deactivate the Easy-Start mode?
    • Place the handle in the plugged-in charger.
    • Easy-start is enabled by holding the mode/intensity button and by pressing the power button once while on the charger. The handle will beep twice to confirm it is enabled.
    • Easy-start is disabled by holding the mode/intensity button and by pressing the power button once while on the charger. The handle will beep once to confirm it is disabled.

Your Opinions

Do you own or have you used the Philips Sonicare DiamondClean Smart?

Are there certain features that you really like or dislike?

Let us know what you think about this brush and let others who may well be considering purchasing one know your opinions before they do.

About Jon Love

Jon is a leading voice on electric toothbrushes and has been quoted by mainstream media publications for his opinions and expertise.

Having handled & tested hundreds of products there really is very little he does not know about them.

Passionate about business and helping others, Jon has been involved in various online enterprises since the early 2000s.

After spending 12 years in consumer technology, it was in 2014 that he focused his attention on dental health, having experienced first-hand the challenge of choosing a new toothbrush.

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