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Published: 21 September 2023

Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison

Author: Jon Love (Leave a comment)
Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison 1

Editor's note

The iO Series 10 is not currently available in Australia. It is available in other parts of the world such as the UK. It has been included in this comparison on the expectation that it will at some point be made available in Australia.

The iO6 is the best value, the iO9 is the best if you want the tech

Best value: Oral-B iO Series 6 (iO6) / Amazon, Shaver Shop / ~$235.06

Best budget: Oral-B iO Series 3 (iO3) / Shaver Shop / ~$119

Best tech: Oral-B iO Series 9 (iO9) / Shaver Shop / ~$399

Our verdict

All of the iO Series brushes have a 2 minute timer, pacer and pressure sensor. These are the key features that dentists recommend.

All models clean your teeth as well as each other.

What sets them apart are additional features. Examples include more brushing modes, in-handle display and ‘smart’ (Bluetooth) technology. These are nice-to-have, but not critical.

The iO6 is the best value option. It strikes the balance between additional features and price. It has some smart features, but not the full suite. 

The iO3 is the most affordable. It does not have smart features.

The iO9 is for those who want all the tech and are prepared to pay for it. It offers far more than you need.

Our Choice
Oral-B iO Series 6 (iO6)
Oral-B iO Series 6 (iO6)
Our Choice
Oral-B iO Series 3 (iO3)
Oral-B iO Series 3 (iO3)
Our Choice
Oral-B iO Series 9 (iO9)
Oral-B iO Series 9 (iO9)
Electric Teeth Rating
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Best value Best budget Best tech
Main differences Black & white display / 5 cleaning modes / 6 zone tracking / standard charger No display / 3 cleaning modes / no Bluetooth / standard charger Colour display / 7 cleaning modes / 16 zone tracking / in the case charging
Amazon $235.06 - -
Shaver Shop $529 $119 $399

Oral-B iO comparison chart

Use the chart below to see the key differences of the Oral-B iO range side by side. Throughout the rest of this article we explain these differences in more detail.

Find out more
Retail price
Number of cleaning modes
Display
Display Additional information
Cleaning mode notification
Cleaning Modes Additional Information
Position tracking
Smart Features Additional information
Brush Heads Additional information
Travel case included
Charging travel case
Battery life
Battery notification
Charging stand connector
Charging time
Battery & charging Additional information
Noise
Oral-B iO Series 3 (iO3)
Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Oral-B iO Series 10 (iO10)
- - - - - - Review -
$199 $299 $399 $499 $549 $649 $749 $999
3 4 5 5 5 6 7 7
- - - yes yes yes yes yes
- - - Black & white. Not touchscreen. Black & white. Not touchscreen. Colour. Not touchscreen. Colour. Not touchscreen. Colour. Not touchscreen
- - yes yes yes yes yes yes
- - Icons on handle Cleaning mode labels & icons on display Cleaning mode labels & icons on display Cleaning mode labels & icons on display Cleaning mode labels & icons on display Cleaning mode labels & icons on display
- - yes yes yes yes yes yes
- - 6 zone real-time tracking 6 zone real-time tracking 6 zone real-time tracking 6 zone real-time tracking 16 zone real-time (3D Teeth Tracking) 16 zone real-time (3D Teeth Tracking). iO Sense charging stand gives feedback via LEDs.
Brush head replacement reminder light Brush head replacement reminder light Brush head replacement reminder light On-screen brush head replacement reminder. On-screen brush head replacement reminder. On-screen brush head replacement reminder. On-screen brush head replacement reminder. On-screen brush head replacement reminder
yes yes yes yes yes yes yes yes
- - - - - - yes yes
14 days 14 days 14 days 14 days 14 days 14 days 14 days 14 days
Yes – LED on handle Yes – LED on handle & smartphone app Yes – LED on handle & smartphone app Yes – In-handle display & smartphone app Yes – In-handle display & smartphone app Yes – In-handle display & smartphone app Yes – In-handle display & smartphone app Yes – In-handle display & smartphone app
2 pin AU 2 pin AU 2 pin AU 2 pin AU 2 pin AU 2 pin AU 2 pin AU 2 pin AU
Up to 16 hours Up to 16 hours Up to 16 hours Up to 12 hours ~3 hours ~3 hours ~3 hours ~3 hours
- - - - Magnetic charging stand Magnetic charging stand Magnetic charging stand Magnetic iO Sense charging stand
64dB 64dB 64dB 64dB 72dB 72dB 72dB 72dB

Please note. Every effort is made to ensure the differences listed are correct. These are subject to change without notice. Products and box contents can change and different variants can exist.

Oral-B iO brush vs brush comparisons

We are often asked which model we pick between 2 specific models. For example iO3 vs iO4. The table shows our answers. For a summary of each comparison, click here.

Models ComparedOur Choice
iO Series 3 vs Series 4iO Series 3 (Shaver Shop)
iO Series 4 vs Series 5iO Series 5 (Shaver Shop)
iO Series 5 vs Series 6iO Series 6 (Amazon)
iO Series 6 vs Series 7iO Series 6 (Amazon)
iO Series 7 vs Series 8iO Series 7 (Amazon)
iO Series 7 vs Series 9iO Series 9 (Shaver Shop)
iO Series 8 vs Series 9iO Series 9 (Shaver Shop)
iO Series 9 vs Series 10iO Series 9 (Shaver Shop)

Brush vs brush key differences

Click below for a list of the key differences between each model.

iO Series 3 (iO3) vs Series 4 (iO4)

  • The Series 3 has 3 cleaning modes (daily clean, sensitive & whitening) compared to the 4 of the Series 4 (daily clean, sensitive, super sensitive & whitening). The extra mode the iO4 has is super sensitive.
  • The iO3 does not have Bluetooth like the iO4.
  • The iO3 LED light ring colour can’t be changed.
  • The Series 3 has a recommended retail price of $199, $100 less than the $299 of the Series 4.
iO Series 4 (iO4) vs Series 5 (iO5)

  • The Series 5 has 5 cleaning modes (daily clean, sensitive, super sensitive, intense & whitening) compared to the 4 of the Series 4 (daily clean, sensitive, super sensitive & whitening). The extra mode the iO5 has is intense.
  • The Series 5 has cleaning mode icons on the handle that the iO4 does not have.
  • You can change the cleaning mode on the iO5 before turning the brush on. You can't do this on the iO4.
  • The iO5 has real-time tracking of 6 zones that the iO4 does not have.
  • The iO5 comes with a refill holder that holds and protects 2 brush heads. The iO4 does not come with this.
  • The Series 4 has a recommended retail price of $299, $100 less than the $399 of the Series 5.
iO Series 5 (iO5) vs Series 6 (iO6)

  • Although both have 5 cleaning modes, they are different. The iO5 has daily clean, sensitive, super sensitive, intense and whitening, whilst the iO6 has daily clean, sensitive, intense, whitening and gum care. The iO5 has super sensitive whilst the iO6 has gum care.
  • The iO5 has a brush head replacement reminder light in the cleaning mode button. The iO6 has this reminder on the display.
  • The Series 6 has a black and white display in the handle whereas the iO5 has backlit icons.
  • The Series 5 comes with a refill holder that holds and protects 2 brush heads. The iO6 does not come with this.
  • The Series 5 takes up to 16 hours to recharge compared to the 12 of the Series 6.
  • The Series 5 gives battery feedback via the power button icon. This is on the display with the iO6.
  • The iO6 comes in 3 colours (black onyx, white alabaster & light rose) compared to the 2 colours (black onyx & white alabaster) of the iO5.
  • The Series 5 has a recommended retail price of $399, $100 less than the $499 of the Series 6.
iO Series 6 (iO6) vs Series 7 (iO7)

  • The Series 7 comes with a magnetic charger that recharges the battery in 3 hours, compared to the standard Oral-B charger supplied with the Series 6 which takes up to 12 hours.
  • The magnetic charger with the iO7 supports 100-240v whilst the iO6 charger supports 220-240v.
  • The Series 7 comes with a refill holder that holds and protects 2 brush heads.
  • The Series 6 is available in 3 colours (black onyx, white alabaster and light rose) compared to the 2 colours of the Series 7 (white alabaster, & black onyx).
  • The Series 6 produces up to 64 decibels of sound compared to the 72 of the iO7.
  • The Series 6 has a recommended retail price of $499, $50 less than the $549 of the Series 7.
iO Series 7 (iO7) vs Series 8 (iO8)

  • The Series 8 has 6 cleaning modes (daily clean, sensitive, super sensitive, intense, whiten & gum care) compared to the 5 of the Series 7 (daily clean, sensitive, intense, whiten & gum care). The extra mode the iO8 has is super sensitive.
  • The Series 7 has a black and white interactive display compared to the colour display on the Series 8.
  • The Series 7 is available in 2 colours (black onyx & white alabaster) compared to the 1 colour (white alabaster) of the iO8.
  • The Series 7 has a recommended retail price of $549, $100 less than the $649 of the Series 8.
iO Series 7 (iO7) vs Series 9 (iO9)

  • The Series 9 has 7 cleaning modes (daily clean, sensitive, super sensitive, intense, whiten, gum care & tongue clean) compared to the 5 of the Series 7 (daily clean, sensitive, intense, whiten & gum care). The extra modes the iO9 has are super sensitive and tongue clean.
  • The Series 7 has a black and white interactive display compared to the colour display on the Series 9.
  • The Series 9 has full 3D tracking for your cleaning performance, monitoring 16 zones rather than the 6 of the iO7.
  • The Series 9 comes with a power2go charging case that allows the iO to be charged inside whereas the Series 7 comes with a standard travel case.
  • The Series 7 has a recommended retail price of $549, $200 less than the $749 of the Series 9.
iO Series 8 (iO8) vs Series 9 (iO9)

  • The Series 8 has 6 cleaning modes (daily clean, sensitive, super sensitive, intense, whiten & gum care) compared to the 7 of the Series 9 (daily clean, sensitive, intense, whiten, gum care & tongue clean). The extra mode the iO9 has is tongue clean.
  • The Series 9 has full 3D tracking for your cleaning performance, monitoring 16 zones rather than the 6 of the iO8.
  • The Series 9 comes with a power2go charging case that allows the iO to be charged inside whereas the Series 8 comes with a standard travel case.
  • The iO9 is available in 2 colours (white alabaster & black onyx) whilst the iO8 is available in 1 colour (white alabaster) only.
  • The Series 8 has a recommended retail price of $649, $100 less than the $749 of the Series 9.
iO Series 9 (iO9) vs Series 10 (iO10)

  • The iO10's magnetic charging stand has iO Sense Technology to give visual feedback (via multiple LEDs) on the brushing routine. The iO9 does not have this.
  • The iO10's pacer is often set to 20 second (sextant) intervals compared to the 30 second (quadrant) intervals of the iO9.
  • The iO9 is available in 3 colours (black onyx, white alabaster & rose quartz) compared to the 2 colours of the iO10 (cosmic black & stardust white).
  • The Series 10 produces up to 64 decibels of sound compared to the 72 of the iO9.
  • The iO9 has a power adapter hardwired into the charging stand and a separate, detachable, adapter for the power2go case. The iO10 has just 1 detachable adapter for both the charging stand and power2go case.
  • The Series 9 has a recommended retail price of $749, $250 less than the $999 of the Series 10.

Detailed comparison: the main things to know about the iO range

The iO Series first launched in 2020, with the Series 7, 8 and 9. It has since evolved from 3 to 8 brushes.

The Series 3 is the entry-level model. This is the least feature rich and most affordable.

The higher the model number the more features and the more expensive it is. The range topping model is the iO Series 10.

Oral-B iO brushes next to each other
The complete iO Series iO3 through to iO10 from left to right

They are similar in more ways than they are different

All of the models have the following features:

  • 2 minute timer
  • 30 second quadpacer (20 second sextant pacer on iO10)
  • Smart visible pressure sensor
    • Lights up red when too much pressure is applied
    • Lights up green when the correct pressure is applied
    • Lights up white when there is insufficient pressure
  • Rechargeable lithium-ion battery offering 14+ days of use between charges
  • Bluetooth technology to connect to a smartphone (the iO3 is the only exception)
  • Quieter, frictionless magnetic drive system
  • Oscillating-rotating cleaning action with micro-vibrations
  • iO-specific brush heads
  • Cleaner, more minimal design compared to other Oral-B models
Graphic showing the different colours of the iO Series smart pressure sensor
iO Series smart pressure sensor - different LED colours and their meaning

They all clean as well as each other

Simply put, they all clean as well as each other.

All models within the iO range use the same brush motor with the same configuration.

Models like the 8 and 9 Series do have extra cleaning modes compared to the 3, 4 and 5. But, these modes don’t change the actual cleaning results.

Using the intense mode won’t necessarily remove more plaque from the teeth and gumline. You don’t need a whitening mode to make your teeth whiter — the daily clean mode can achieve this.

Your brushing time and technique have a far bigger impact on the cleaning results than the mode you use.

Man brushing teeth with Oral-B iO brush
Jon bushes teeth with iO3 that brushes as well as any other iO model

Various price points to suit different budgets

$99 is the price for the most affordable model, the iO3.

The most feature-rich brush is the iO10. It costs $549. That's a difference of $450 for some extra cleaning modes and smart technology tracking features. Justifying this premium is very difficult.

But these prices account for the typical 50% discount on retail prices. $800 is the difference if we compare the ‘recommended retail prices’.

All brushes in the range use the same iO specific brush heads. Whether you opt for the iO3 or iO10, the long term ownership cost will be impacted most by the initial purchase price of the brush handle, not the heads.

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Retail price Typical selling price Approximate 3 year cost
$199 $99 $297
$299 $150 $348
$399 $200 $398
$499 $250 $448
$549 $275 $473
$649 $325 $505
$749 $375 $555
$999 $549 $729

Of course, the table and quoted prices are just a guide. The actual selling prices vary from one retailer to another. 

As you might expect, models with extra features or increased box contents do command a premium.

The iO3 is the cheapest and has the essentials anyone needs. 

Assuming you want something a bit more capable, then the iO6 represents the best value option. It has many of the most desirable features of the iO range, including the in-handle display. But, it remains relatively affordable and you get the best of both worlds, so to speak.

Whilst the iO10 is the most technically advanced, we don't recommend it. The only difference between the iO9 and the iO10 is the enhanced charging stand and it’s simply not worth that kind of money. 

Monochrome vs colour display of iO7 vs iO8
Black and white display of iO7 (left) vs colour display of iO8 (right)

5 of the 8 variants have a display built into the brush handle

3 of them are colour, the other 2 are black and white.

Colour or not, they operate in the same way and provide extra functionality. For example, you can change the handle language, change the colour of the smart ring or even reset the brush.

The biggest benefit is that it makes it much easier to switch between the brushing modes or see which one you have selected.

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Display Display Additional information
- -
- -
- -
yes Black & white. Not touchscreen.
yes Black & white. Not touchscreen.
yes Colour. Not touchscreen.
yes Colour. Not touchscreen.

All the brushes have more cleaning modes than you need

Depending on the model you go for, you have the choice between 3, 4, 5, 6, or 7 brushing modes. 7 is the maximum number of cleaning modes available on any Oral-B brush.

I’ve yet to find anyone who uses them all or any real justification for having so many. The reality is the cleaning results between each are very similar.

For most users, 1 mode, daily clean, is more than satisfactory.

A second, lesser powered mode such as sensitive is a welcome addition for new electric toothbrush users, or those with gum disease or sensitivity.

Each of the modes use different amounts of power from the motor. This impacts the angle of oscillation at the bristle tips to create brushing patterns and effects that are different from one another.

All modes are designed to be used for 2 minutes. The only exception is tongue clean which is set for 30 seconds.

The table below shows which iO model has which mode. Should you want to learn more about each, do read our Oral-B cleaning modes explained article.

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Number of cleaning modes Clean Sensitive Gum White Deep Clean Tongue Other modes
3 yes yes - yes - - -
4 yes yes - yes - - super sensitive
5 yes yes - yes - - super sensitive, intense
5 yes yes yes yes - - intense
5 yes yes yes yes - - intense
6 yes yes yes yes - - Super sensitive, intense
7 yes yes yes yes - yes Super sensitive, intense
7 yes yes yes yes - yes Super sensitive, intense

Some models don’t make it clear which cleaning mode you have selected

The iO3 and 4 do not have any labels or icons on the handle to show which mode you have selected. 

The iO5 has backlit icons, without text based names to show which mode is active. 

The Series 6, 7, 8, 9 and 10 will show an icon alongside text on the handle display.

Models that connect via Bluetooth to an app will report the active mode within the on-screen timer.

You can’t change the mode before turning the brush on with the iO3 and 4.

Oral-B iO Series 5 in the hand
Tooth icon on the iO5 represents 'daily clean' mode

‘Real-time tracking’ varies from one brush to another

Real-time tracking is part of the smart technology offered by the iO series. It works with the Oral-B app on your smartphone to show you a graphic image of how well you are brushing your teeth.

The iO3 has no Bluetooth connectivity and can’t be connected to the Oral-B smartphone app. Therefore it has no real-time tracking.

The iO Series 4 has Bluetooth and will connect to the app, but the functionality is limited. There is no real-time tracking — the on-screen timer that tells you have long you have brushed for is the main functionality.

The iO5 through to 10 do have real-time tracking.

However, Series 9 and 10 are the only models to offer comprehensive 16-zone tracking. The iO 5, 6, 7 and 8 only have 6 zone tracking.

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Position tracking Smart Features Additional information
- -
- -
yes 6 zone real-time tracking
yes 6 zone real-time tracking
yes 6 zone real-time tracking
yes 6 zone real-time tracking
yes 16 zone real-time (3D Teeth Tracking)
yes 16 zone real-time (3D Teeth Tracking). iO Sense charging stand gives feedback via LEDs.

The following video helps explain the differences.

There is a strong argument to suggest that the iO9 and 10’s tracking of 16 zones can encourage you to brush all your teeth better than when you track just 6 zones. But, how much difference this makes in everyday use is up for debate. To get maximum benefit from it you need to use the app every time you brush.

The 16 tracked zones are as follows:

  • Upper rear right
    • Front surface
    • Biting surface
    • Inside surface
  • Upper font
    • Front surface
    • Inside surface
  • Upper rear left
    • Front surface
    • Biting surface
    • Inside surface
  • Lower rear right
    • Front surface
    • Biting surface
    • Inside surface
  • Lower front
    • Front surface
    • Inside surface
  • Lower rear right
    • Front surface
    • Biting surface
    • Inside surface
Graphic showing the 16 tracked zones with Oral-B real-time tracking

Whereas the 6 zones tracked with the other models are:

  • Upper rear right
  • Upper front
  • Upper rear left
  • Lower rear right
  • Lower front
  • Lower rear right
Graphic showing the 6 tracked zones with Oral-B real-time tracking

When only 6 zones are tracked, you can essentially spend all the time cleaning only 1 of the surfaces within that zone and the app will still consider the zone cleaned. 

With 16 zone tracking, dotted zones sit in the centre of the on-screen display. As each zone is brushed correctly, that dotted zone disappears until none remain. All the teeth on the large visualisation turn white. The extra detail in the tracking can pick up on more specific, but important improvements needed in your brushing routine.

Although the iO10 has 16 zones tracking, the iO Sense stand is configured to give feedback on 6 zones. It has benefits (more on those below) and offers at a glance feedback without a smartphone, but the app provides more meaningful data.

There is no long-term data available that analyses if apps and real-time tracking do have a beneficial impact compared to someone learning the correct brushing techniques via other means, such as plaque disclosing tablets.

iO10 in hand with smartphone app showing real-time brushing
16 zone real-time tracking available on iO Series 9 and 10

Brush head replacement reminders are implemented differently

A brush head should be replaced after about 3 months. After this, the bristles clean less effectively and are more abrasive on the teeth and gums. There may also be an increased amount of bacterial build up.

All iO models have a reminder system built into the app and the brush handle. How this reminder is displayed differs.

The iO3, 4 and iO5 have a yellow light that illuminates in the centre of the cleaning mode button. The handle will vibrate too.

Those models with a display will show a notification on the screen. If connected to the Oral-B app, a notification will be displayed here too for compatible models.

Overall, brush head reminders are a feature that are nice-to-have, but not critical. If you’re organised enough you can simply use a recurring calendar reminder. The fact that they are included on each iO model means you don’t need to factor this feature too heavily into your choice of iO brush models. 

Battery life should be similar, but premium models are inconsistent

To my knowledge, all brushes have the same battery. All are claimed to last 2 weeks on a single charge.

For the most part, they do. Models like the iO3 and 4 last as many as 18-20 days.

Yet, my testing found that 12 days of use is common with the iO9.

I can’t categorically say what’s causing such variance. My suspicion is the colour displays. I will often see it activated as a result of vibration or movement nearby, thus drawing power from the battery. 

The iO7, 8 and 9 come with a premium magnetic charging stand

The 3, 4, 5 and 6 all come with a standard Oral-B charger. White in colour, it has a protuberance on the top that fits into the base of the brush handle.

A power adapter is hardwired into it. The adapter supports 220-240v.

Brushes take 12-16 hours to recharge when on this stand.

The iO Series 7, 8 and 9 come with a premium magnetic stand. It’s either white or black.

The 2 different charging stands used by iO brushes
Standard charger (left) vs premium magnetic charger (right)

The round charger has no protuberance and supports 100-240v. It takes up to 3 hours to recharge the brushes on this stand.

Only the iO7, 8, 9 and 10 fit and will charge on this stand.

For me, the fancy charging stand isn’t too big a factor. If bathroom visuals are important to you, maybe the magnetic stand is worth paying for. Otherwise, you can get by just fine with the cheaper stand. 

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Charging time Charging stand included Voltage support Battery & charging Additional information
Up to 16 hours yes 220-240V -
Up to 16 hours yes 220-240V -
Up to 16 hours yes 220-240V -
Up to 12 hours yes 220-240V -
~3 hours yes 100-240v Magnetic charging stand
~3 hours yes 100-240v Magnetic charging stand
~3 hours yes 100-240v Magnetic charging stand
~3 hours yes 100-240v Magnetic iO Sense charging stand

The iO10’s stand is a bit different 

With the iO10, you get an iO Sense charging stand, which is magnetic and charges the brush in up to 3 hours. But, there is extra tech built-in.

You have 6 LEDs and a clock on the front to help encourage even brushing and good coverage of your teeth as you brush.

The idea is you get meaningful feedback on how well you are brushing without having to refer to the smartphone application. 

It’s a nice enough feature, but it increases the cost of the brush. It’s the only difference between the iO9 and iO10 but changes the price by $250 (anticipated), which just isn’t worth it. 

Oral-B iO10 with iOSense Smart Charger
iO10's charging stand gives feedback on brushing time or coverage using LEDs

The handles with displays give the best battery feedback

All the handles offer some feedback on the remaining charge, but how they do this is different.

Those with displays show a battery icon and a percentage of the remaining charge after each brushing session.

The iO3, 4 and 5 give feedback via the LED in the power button. It illuminates white most of the time. Only when the charge is around 10% or less does it pulse red.

Those that connect to the Oral-B app will show a percentage level on-screen too.

Oral-B iO Series 8 next to iO9

Only the iO9 and 10's travel cases offer in the case charging

The vast majority of iO models come with a travel case provided in the box.

The case will protect the brush handle from damage and accidental activation, whilst also protecting up to 2 brush heads.

There are some more differences between the cases to be aware of too.

Oral-B iO Series 10 being charged whilst inside it's travel case
iO9 and 10 can be recharged whilst inside their travel case - requires separate power adapter

The iO9 and 10 can hold the handle and 1 brush head only. This is because you can charge the brush inside the case. There is no battery in the case to do this. Instead, you connect the supplied proprietary power adapter.

Whilst all cases are functional, those supplied with the 7, 8, 9 and 10 are higher quality — they are thicker and more durable.

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Travel case included Brush head storage Charging travel case Travel case Additional information
yes 2 - -
yes 2 - -
yes 2 - -
yes 2 - -
yes 2 - -
yes 2 - -
yes 1 yes Proprietary power cable with 2 pin AU adapter. No battery in the case itself.
yes 1 yes Proprietary power cable supporting 100-240v with 2 pin UK adapter. No battery in the case itself.

The iO Series handles are quieter than other Oral-B brushes

iO handles are generally quieter in use than non-iO models from Oral-B.

The majority of iO models now operate at a maximum noise level of 64 decibels. 

The 7, 8 and 9 were the first iO models to launch. They registered higher in our testing. Oral-B may have made changes since launch to reduce this and bring it in line with other iO models. We haven’t purchased these models again to check this.

No mention of noise is made in the iO 7, 8 and 9 manual, whereas it is with the others.

Oral-B iO Series 3 (iO3)
Oral-B iO Series 4 (iO4)
Oral-B iO Series 5 (iO5)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 7 (iO7)
Oral-B iO Series 8 (iO8)
Oral-B iO Series 9 (iO9)
Oral-B iO Series 10 (iO10)
Noise
64dB
64dB
64dB
64dB
72dB
72dB
72dB
72dB

The light ring can be changed on all models apart from the iO3

All models have a light ring that doubles up as the visible pressure sensor.

With the exception of the iO3, the colour of that ring can be changed. 

You need to use the Oral-B app to change the colour.

The iO6-10 does allow the colour to be changed via the in-handle display. But, you have fewer colour choices than if you navigate to the app.

There is some variance in the colours available

As a general rule, all models are available in black or white. Some are available in other colours too.

Oral-B offers select heads in black as well as white. Black handles are supplied with a black brush head.

White and all other coloured handles usually come supplied with a white brush head.

Travel cases are usually white, except for black models.

Charging stands are always white unless you buy the Series 7, 8 or 9, where they are available in black too.

iO3iO4iO5iO6iO7iO8iO9iO10
Number of Colour Choices22232112
Handle ColoursBlack / Ice BlueBlack Onyx /
White Alabaster
Black Onyx /
White Alabaster
Black Onyx /
White Alabaster / Light Rose
Black Onyx /
White Alabaster
White AlabasterBlack Onyx /
White Alabaster
Cosmic Black / Stardust White

A refill holder is included with some models

Included with some models is an accessory known as the brush head refill holder. This is a little stand cum travel case for brush heads.

Up to 2 heads can be placed on the nodules that protrude from the silicone base.

It sits upright on a countertop and gives a home for spare and replacement heads. A removable opaque cap protects them whilst allowing airflow inside to dry wet bristles.

Different variants do or do not come with this in the box, but expect to get this included with the iO7, 8, 9 and 10.

Conclusion: we recommend the iO6

Oral-B iO Series 6 (iO6)
Oral-B iO Series 6 (iO6)
Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison 2 Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison 2 Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison 2 Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison 2 Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 Comparison 2

All things considered, the differences between each model in the iO Series range are relatively subtle.

No one toothbrush is going to result in dramatically better cleaning results.

All of these brushes offer more than what you need.

The iO6 is the best value model.

The iO3 is the most affordable and the iO9 has all the tech.

iO models command a price premium, particularly when you factor in replacement brush heads. You don’t need a premium model to clean your teeth well.

The Oral-B Pro 2 2000 does a decent job for a fraction of the price! All things considered, we rate it as the best electric toothbrush and it’s worth considering unless you’re set on particular features from the iO range. 

Author: Jon Love

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