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Best Cordless Water Flosser 2021

Medically Reviewed By: Dr. Gemma Wheeler

(GDC Number: 259369)

Best Cordless Water Flosser 2021 1

We rate the Waterpik WP-560 as the best cordless water flosser, all things considered.

In this post we explain how we came to this decision, and offer some alternative options should you be looking for something slightly different.

Our in-house dentist Dr. Gemma Wheeler explains the evidence for using a water flosser, and our buyer’s guide includes further advice to help you decide.

Our recommendations at a glance

Best overall: Waterpik WP-560 Cordless Advanced (Amazon, eBay)

Easiest to use: Sonicare AirFloss Ultra (Amazon, Walmart)

Best budget: Fairywill 5020E (Fairywill, eBay)

In this post


Dr. Gemma Wheeler, BDS (Hons)

Best Cordless Water Flosser Rework V2 2

Can a water flosser improve your oral health? 


When used in addition to toothbrushing, a water flosser can reduce bleeding gums by 37% (research by Lyle).  

They are recommended by the European Federation of Periodontology.

Can a water flosser replace traditional floss? 


The limited evidence available does say water flossers are more effective than flossing.

A water flosser doesn’t replace interdental brushes, which are the most effective interdental cleaning method.

Water flossers and interdental brushes have been proven to reduce signs of gum disease, such as bleeding and swelling.

Do dentists recommend water flossers?

I do advise water flossers for some people. They do have some positive effects on gum health, as proven in independent research

But, interdental brushes are my preferred recommendation for interdental cleaning (because the overwhelming evidence shows that interdental brushes are the most effective method for cleaning interdentally). 

Even with the evidence available, I know that the most effective type of interdental cleaning is the one that you will actually do. I want to support people to make a habit.

In my experience, the people who buy water flossers will commit to actually using them. More so than with floss! I’m not sure what all the reasons are behind this.

My recommendation to patients is to find a cleaning method that works for them, and there is certainly a place for water flossers.

Can I use a water flosser with braces, crowns, veneers, bridges or implants?


It is safe to use a water flosser with these types of dental appliances and restorations.

Jump to evidence section >>

Buying Advice

What to look for in a cordless water flosser

Cordless water flossers offer a variety of different features. Not all are necessary.

From our testing, the most essential features of a portable flosser are:

45 seconds or more flossing time

Flossers with a water tank of around 200ml will achieve this. 45 seconds is enough time to get a thorough clean without having to refill. It can make the flosser slightly heavier but it is a worthwhile trade off.

2 or more pressure modes

If you have sensitive gums it is useful to be able to adjust the pressure.

Rotating nozzle

Having a 360 degree rotating nozzle makes it easier to reach all parts of the mouth.

Comfortable grip

From our testing, a large area for the palm and fingers to grip onto is better than a slim handle. It’s also helpful if the grip is made from materials that prevent slippage, particularly when wet.

Jump to buyer’s guide section >>

How we chose

Our selection process

Our team is made up of dental professionals and experienced product testers.  We specialize in oral health and abide by a strong code of ethics

We buy and test every product we recommend.  In most instances, we have detailed written and video reviews for each product.

We consult the clinical evidence, the feedback from consumers and industry leaders.

Together, we ensure our recommendations include only the very best choices.

We regularly review our recommendations based on newly released products and clinical evidence.

More on how we test products >>

Best cordless water flosser 2021 — our recommendations

In the sections below we go into detail about the products we have tested and explain our recommendations.

Dr. Gemma Wheeler answers common pre-purchase questions and explains why she recommends water flossers.

Best Overall

Waterpik Cordless Advanced WP-560

$59 – $79 on eBay*

*Prices correct at time of writing

Why we chose it: 

The Cordless Advanced has all the features we recommend for a cordless water flosser. 

The shape and gripping points make it comfortable to hold. It is easy to rotate the nozzle so that you can reach all parts of the mouth. 

From our testing, the tank provides at least 45 seconds of cleaning time. This is enough to clean the entire mouth. It’s simple to adjust the pressure of the water thanks to the 3 different settings.

It has been independently approved by the Oral Health Foundation and American Dental Association. This means that the flosser has been assessed by an independent panel of experts, and that it is safe and that it has the benefits it says it does.

What we like

  • 45+ second flossing time
  • Easy to rotate the nozzle
  • Grippy handle
  • 3 pressure settings
  • Easy to attach magnetic charger
  • Different color options available
  • Travel pouch included in the box

What we dislike

  • Price – it is expensive
Waterpik WP-560 Cordless Advanced

Easiest to use

Sonicare AirFloss Ultra

$90 From Walmart*

*Prices correct at time of writing

Why we chose it: 

The AirFloss Ultra is the easiest to use (and least messy) of all the flossers we’ve tested. 

The water is mixed with air and fired in short bursts, rather than a constant stream. This makes it possible to clean the mouth in 60 seconds. 

The main downside is that it doesn’t clean below the gumline like other water flossers.

What we like

  • Really simple to use
  • Less messy
  • 3 settings
  • Good battery life
  • Battery status light
  • American Dental Association approved

What we dislike

  • Small reservoir
  • Targets between teeth only
  • More expensive option
Sonicare AirFloss

Best budget

Fairywill 5020E

Best Cordless Water Flosser 2021 2

$27.99 From Fairywill*

$30.99 on eBay*

*Prices correct at time of writing

15% discount available from Fairywill using code ELECTRICTEETH (when no other offers are running)

Why we chose it: 

The Fairywill 5020E doesn’t have the same clinical evidence as the competition, but it performed comparably in our testing. 

We found the nozzle harder to rotate than other models, but it still cleaned the teeth well. 

The 10.5oz (300ml) tank lasted an impressive minimum of 90 seconds, even on the most intense of the 3 modes. 

It’s not quite as comfortable to use as the others and only comes with a 1 year warranty, but it’s a good budget choice.

What we like

  • 90+ seconds flossing time
  • 3 pressure settings
  • Long battery life
  • USB charging
  • Different color options available

What we dislike

  • Difficult to rotate the nozzle
  • Warranty is only 1 year
  • Small port cover that is easy to lose
Fairywill 5020E Cordless Water Flosser

Our choices explained

Over the years we’ve tested a wide range of cordless water flossers. 

Only a select few make it into our top picks, but in all honesty, it is quite rare for a product to be bad. 

The best options really do stand out for one reason or another.

Dr Wheeler has researched the various types of interdental cleaning. Which is better? String floss, water flossers or interdental brushes?

Evidence shows that interdental brushes are the most effective method for cleaning interdentally. Dental floss is the least effective.

Water flossers are more effective than string flossing. That is according to the limited evidence available. Water flossers are recommended by the European Federation of Periodontology.

But when choosing a tool for flossing, it’s important that you pick something that you will use regularly. The more comfortable a product is to use, the more likely you will use it. 

Comfort was a key consideration in our choice for the best water flosser, the Waterpik WP-560. 

The curved design of the flosser and the large area of raised dots on the back make it easy to hold.  It feels comfortable in hand, which helps to control the flosser when in use. 

Waterpik Cordless Water Flosser
The WP-560 has the most comfortable grip of the cordless water flossers we’ve tested

Rotating the nozzle is the easiest of any water flosser we have tested. The large wheel used for rotating the nozzle feels natural to use with good feedback. Being able to rotate the nozzle makes it easier to reach all parts of the mouth. 

The 207ml water tank gives 45 seconds of use on the most powerful of the 3 pressure modes.  This is plenty of time to clean thoroughly and means you don’t need to rush. This makes it easier to focus on using the correct technique. 

Having a variety of easy-to-use pressure settings is another key consideration. It is important to be able to change the pressure, to a lower setting, if you have sensitive teeth or gums.

We have found the Sonicare Airfloss the easiest to use, so we have included it as an alternative to the WP-560. The compromise is that it targets between the teeth only. You can’t use it to clean along the gumline like you can with other cordless water flossers. 

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We rate the Sonicare Airfloss as the easiest cordless water flosser to use.

Both the American Dental Association (ADA) and Oral Health Foundation have approved the Waterpik WP-560. The Airfloss has the ADA ‘Seal of Acceptance’. We explain these certifications in more detail below.

The final recommendation on our list is the Fairywill 5020E, which is our best budget pick. 

It hasn’t achieved any seal of approval, but our own testing confirms it performs comparably.

Fairywill is cheaper and does the job. It is more than good enough. It lacks the clinical evidence of Waterpik. Other elements of the WP-560 make it a more refined product. It is the better flosser to use. It is a product you are going to want to pick up more regularly and in turn form a better habit.

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The Fairywill 5020E is our recommended choice if you’re on a budget.

There are a variety of other brands that exist at the lower end of the price scale. Fairywill is one of the more consistent and reputable options in that space. Many of the cheaper flossers come with a 1 year warranty, compared to the 2 years from Waterpik and Sonicare.

Between the mid and high end of the cordless water flosser price range, there isn’t a huge variation. We do then recommend the WP-560 Cordless Advanced given everything it offers.

Other flossers we have tested

Only a select few of the cordless oral irrigators we test actually make it into this best list.

Hours of hands-on testing allow us to recommend only products we would use on a daily basis.

In all honesty, it is quite rare for a product to be bad. The vast majority of water flossers are satisfactory.  

Most do meet the minimum requirements we set out for a good portable flosser.

Thus, the best options really do stand out for one reason or another.

Oral-B’s Water Flosser Advanced demonstrates this point.

It has 45 second flossing time and at least 2 pressure settings. It has 2 weeks of battery life and a water resistant design.

It has a rotating nozzle and is comfortable to hold.

But, it does not feel the best quality. The retaining clip for the water tank feels weak, and the nozzle does not rotate easily.

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The Water Flosser Advanced from Oral-B doesn’t feel the best quality.

The different pressure settings and modes are made more complicated than they need to be.

It comes with a bulky charging stand that is less than ideal for travel.

Even Waterpik, the brand leader, doesn’t get it right all the time.

Its WF-10 Cordless Select is a great water flosser on paper.

In fact, the USB magnetic charging cable is brilliant to use. 

Yet the design means you don’t have a lot of surface area to grip onto. Your hand feels restricted, which makes it feel less comfortable to use.

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Waterpik WF-10 Cordless Select

This is less of an issue with the WP-450 Cordless Plus from Waterpik.  But, it is now a much older model that looks and feels dated.

Yes, it works and does what it needs to do.

But, it has an exposed charging port on the front. And there is no light to give feedback on the rechargeable battery.

The nozzle is harder to rotate and the quality feels worse than newer units from Waterpik.

Like the Cordless Plus, the WF-03 Cordless Freedom is another cheaper option.

The WF-03 Freedom is one of the only cordless options that uses removable AA batteries. 

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Waterpik Cordless Freedom with removable batteries

It cleans the teeth well. It is American Dental Association approved like other Waterpik models.

But you cannot rotate the nozzle and the water tank has a capacity of 150ml.  These are compromises that have to be made for the benefit of removable batteries. Unless you are traveling frequently and unable to charge a built-in battery, removable batteries do not offer any added convenience. 

Waterpik does dominate within this space, for good reason.  They have invested most heavily.  They have a range of flossing tips that you don’t get with Oral-B, Panasonic and Fairywill.  They accommodate the more specialized needs much better.

Both Oral-B and Philips have the ability to compete better than they do currently.  The AirFloss is a great option, but it isn’t a true water flosser.

Plenty of other brands exist.  ATMOKO, Mornwell, Hangsun, Liberex, Bestope and Nicwell to name a few.  All have pros and cons but don’t quite make it to be absolute recommendations.

Buyer’s Guide

Useful pre-purchase advice

In the sections below we’ve added useful notes and tips from our research and testing.

No doubt you’ll have one or two particular questions before buying, as did we.

Browse the sections below, and if you can’t find the information you need, please leave a comment at the bottom of this page and we’ll get back to you.

What is a cordless water flosser?

A cordless water flosser is a specially designed tool. It helps clean between the teeth and along the gumline.  

It is an alternative product to dental floss and interdental brushes.

A water tank and pump are built into the portable unit.

The water is then pushed out at pressure via a nozzle on the flosser.

The aim of the jet of water is to break up the plaque layer (which contains bacteria) and dislodge food particles in the mouth. It also has some effect of massaging the gums.

A built-in rechargeable battery, or in some instances removable batteries, powers the device.

The cordless design is more convenient for many.  It is a more travel-friendly option too.

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What is the evidence for and against water flossers?

Water flossers are one of the less common forms of interdental cleaning.

They are safe, with little ability to cause damage to the gums.

It seems that water flossers do not fully remove plaque. Despite this, they can still have a positive effect on the gums.

Waterpik has listed a large amount of clinical research on its website. Some people could perceive this as biased. But it is worth noting that it is independently scrutinized to be published in peer-reviewed journals. This means that you can discount any obvious problems with their data. However, do consider that they are unlikely to promote data that doesn’t support their hypotheses (read: advertising claims). Many of the articles are not available in full online, only the Waterpik summary or the paper abstracts.

Highlights from their research are (the link will lead you to the journal article, not the Waterpik page):

  • Using a water flosser in addition to toothbrushing reduces bleeding gums and plaque levels. Lyle et al. compared bleeding scores and plaque levels in two groups: those using only an electric toothbrush; those using an electric toothbrush + water flosser. They found that the group who used the water flosser had decreased levels of bleeding gums. The plaque levels were also lower in those using the water flossers. Although these results were of less statistical significance.
  • Waterpiks reduce gingival inflammation more than flossing does. Barnes et al. 2005 study found a Waterpik to be more effective than string floss in reducing gingival bleeding. This study compared manual toothbrush + floss to manual toothbrush + water flosser and sonic toothbrush + water flosser. They miss out a key comparison group: sonic toothbrush + flossing. This makes the evidence somewhat skewed in favour of the water flosser. Much of the benefit of switching to a powered brush is presented as being the water flosser, but there is no way to compare.
  • Water flossers are effective and safe for implants. Kotsakis et al. showed that water flossers are as effective as interdental brushes and more effective than chlorhexidine mouthwash. They reduce the amount of bacteria on implants, without damaging the implant surface. 

Independent reviews and papers support most of these claims. 

Independent reviews by Ng and Lim as well as Worthington et al showed that water flossers do not reduce plaque levels. This is also shown in Waterpik’s own study in 2011

Despite ineffective plaque removal, water flossers do reduce inflammation of the gums. They reduce bleeding from the gums, an indicator for active gum disease.

Water flossers might not reduce levels of plaque, but it is thought they do disrupt forming plaque from above and below the gum level. The theory is that this changes the structure of the plaque layer. If the plaque structure is altered, it may cause less inflammation in the gums. But at present, this is only a theory.

The water flossers also flush out food debris.This 2015 review by Sälzer et al also supports water flossers for improving gingival health versus no interdental cleaning aid. The European Federation of Periodontology (EFP) also recommends water flossers for interdental cleaning in their evidence based guidelines.

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Can a water flosser replace traditional flossing?


The reviews already mentioned do show support for water flossers. Floss is also ineffective in most cases.

The limited evidence available does say water flossers are more effective than flossing.

But interdental brushes are more effective at cleaning than water flossers.Our post “Water Flossing vs Dental Floss vs Interdental Brushes” compares the different methods in more detail.

Who should use a water flosser?

Overall, water flossers are not the most effective method for plaque removal. But they still show benefits for gum health.

They are a good option for someone who has tried and failed to use interdental brushes.

Our in-house dentist Dr. Gemma Wheeler says:

“I would recommend a water flosser to certain people:

  1. Those who have limited hand mobility and so struggle with interdental brushes. 
  2. People with large gaps where a brush doesn’t fit but food gets trapped.
  3. Those who won’t use floss and brushes due to a gag reflex, negative experience, or who can’t get the technique right.
  4. Someone with braces, to help clean around the brackets.

I also say anyone who wants to try them can add them to an existing routine e.g. interdental brushes. 

Even with the evidence available, I know that the most effective type of interdental cleaning is the one that you will actually do. I want to support people to make flossing a habit.”

Cordless vs corded (countertop) water flossers

If you have space (approx 6 x 6 inches) for one in your bathroom, we recommend going for a countertop water flosser over a cordless water flosser.

We’ve found countertop models slightly more comfortable to use. They also have larger water reservoirs, meaning they have longer cleaning times and need to be refilled less often. They often come with extra features, such as extra pressure settings or a built-in timer.

There is no evidence to suggest one is better than the other. There are scientific studies that confirm the effectiveness of both. In our own hands-on testing, we have found them to be as effective as each other.

That being said, a cordless water flosser is still a perfectly good option if you don’t have space for a countertop model, or if you travel a lot.

Countertop units need a power outlet.  They need to be plugged in for them to work. You are therefore more restricted on where you place them.  

Cordless units are wire-free. This makes them more portable and convenient, particularly if you don’t have a socket in your bathroom.

How important are pressure settings?

Having different pressure settings is very useful.

You might not need to switch between them all the time, but having the choice is valuable.

Whilst countertop water flossers can have as many as 10 settings, 2 or 3 is common for cordless models.

You want at least a low and a high setting. As the names imply, the pressure varies between these.  Low is more gentle and high more intense.

Pressure is measured in Pounds Per Square Inch (PSI) or Bar. Typically the pressure ranges from 10 to 100PSI, although some models reach as much as 160PSI. 

Low pressure tends to be around 30-45PSI and high 60-80PSI, subject to model. 

The extra power can blast away more debris. But, sheer force is not essential and may feel uncomfortable to some people.  Lower pressure with the correct technique is equally as effective. 

There is no evidence to support using higher power over a lower power.

A low setting is ideal for inflamed, sensitive and bleeding gums. 

If you have healthy teeth and gums, the higher setting can be used.

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Key tips for water flosser use

Create a regular habit. Doing so will have the biggest impact, over and above the cordless water flosser you choose.

  • Clean between the teeth with the water flosser at least once a day
  • Use the correct flossing technique

Ensure that alongside flossing you:

  • Brush your teeth twice a day with a fluoride toothpaste
  • Brush for 2 minutes each time
  • Use the correct brushing technique
  • Spit after brushing, don’t rinse with mouthwash or water

The cordless water flosser features we regard as essential

From handling and testing lots of water flossers, we’ve come to regard some features as essential, and others as nice to have but not a dealbreaker if they are missing.

We deem the essential features of a good portable flosser to be:

45 seconds or more flossing time

Flossers with a water tank of around 200ml will achieve this. 45 seconds is enough time to get a thorough clean without having to refill. It can make the flosser slightly heavier but it is a worthwhile trade off.

2 or more pressure modes

If you have sensitive gums it is useful to be able to adjust the pressure.

Rotating nozzle

Having a 360 degree rotating nozzle makes it easier to reach all parts of the mouth.

Comfortable grip

From our testing, a large area for the palm and fingers to grip onto is better than a slim handle. It’s also helpful if the grip is made from materials that prevent slippage, particularly when wet.

Features that are nice to have, but not critical

There are lots of extra features that can be built into a flosser.  These are in our opinion not essential. They are nice to have if they are included:

2+ week battery life

A battery life stated as being at least 2 weeks allows for a good amount of use between charges.

Battery status/charge light

A battery status or charge light gives you a clear indication of how much power actually remains. You know when it will need recharging and there is less chance the flosser will cut out on you mid session.

Backed by clinical evidence

Scientific studies that have tested the product and confirm what it can achieve.

Approved by dental bodies and organizations

Independent assessment of the product and any clinical data that exists. Examples include the Oral Health Foundations “Approved” status and the American Dental Association’s Seal of Acceptance.

Mode/pressure setting notification lights

Visible indicators to show the selected mode.

Variety of flossing tips

Interchangeable tips make the water flosser more adaptable to different use case scenarios. For example, some tips are designed to safely reach into periodontal pockets. These allow for deeper cleaning beneath the gum-line.

Nozzle storage 

Some flossers come with a place to stow any additional/replacement nozzles, which helps to keep the bathroom tidy. A removable lid cum storage compartment also works well.

Travel pouch/case

It’s a bonus if the flosser comes with a protective cover to prevent damage, leaks or accidental activation when in transit, but it’s not a deal-breaker if it isn’t included.

USB charging

USB charging offers a more convenient option as the cable tends to be smaller with no bulky power brick. It’s particularly useful for regular travelers.

2 Year warranty

Ideally the flosser will come with a warranty of 2 or more years so that you have the peace of mind that should the product fail it will be repaired or replaced. Typically products do come with a 2 year warranty, but there are some that only come with 1 year.

Pros & cons of cordless water flossers


  • Convenience
    • Fill the tank and switch it on. 
    • It is less hassle than pulling out a length of floss and wrapping it around the fingers. Not to mention then feeding it between the teeth.
    • Rotating nozzles make it easy to reach awkward spots in the mouth.
    • The long nozzle makes it easy to reach the back teeth.
  • Takes less time 
    • You can complete a thorough floss of the teeth with a water flosser quicker than you can with string floss.
  • Reduce inflammation and bleeding of the gums
    • The water reaches spaces that a toothbrush or traditional floss can’t. Notably, under the gumline. This means bacteria and debris that cause inflammation and bleeding are removed.
  • They disrupt more plaque
    • Traditional string floss requires a very specific technique to be effective.
    • Water flossers are easier to use to disrupt the plaque layer.
  • They are more gentle on the gums
    • Incorrect flossing technique can be painful or damaging to the gums.  
    • The pressurized water feels softer and gentle on the gums. It will stimulate blood flow.
    • Variable pressure settings allow you to find the right pressure for you.
  • Suitable for braces, implants and bridges
    • The water flow allows for a quick and effective clean around dental appliances.
  • They are easier for people with limited mobility (dexterity)
    • The nozzles allow for much easier positioning and reach into the mouth.
    • There are fewer fingers and thumbs and awkward movements.
  • Different nozzles
    • A variety of nozzles allow for a more personalized oral care routine.
    • Individual circumstances, such as periodontal disease can be more effectively treated at home.


  • Environmental impact
    • No studies into the environmental impact of water flossers exist yet. 
    • In 2020 a study compared electric toothbrushes to manual alternatives. Electric brushes came out worse in many areas.
    • The weight and electrical components likely make water flossers less environmentally-friendly. This is in comparison to other flossing options.
    • The heavy use of water also has a large impact on the environment. 
  • Size
    • Even the most compact cordless water flosser isn’t as travel friendly as a reel of traditional floss.
  • Noise
    • The water flosser makes quite a bit of noise when in use.
  • Price
    • A cordless water flosser is more expensive than string floss or floss sticks.
  • Interdental brushes are more effective
    • Despite the ease of use, interdental brushes produce better results.
    • Plaque isn’t removed as effectively.
  • Water tank size/pressure settings
    • Each flossing session is limited to the size of the water tank and the pressure setting selected. You may have to refill the tank multiple times to complete the clean.
  • Sink access
    • You need to be lent over a sink, even with a cordless, due to the amount of water that needs to be expelled during use.
  • Batteries/power
    • Water flossers will require recharging or replacement batteries.

How do the different nozzles / tips work?

The type of nozzles or jet tips that fit a water flosser are interchangeable.

This means they can be changed as and when you like.

The most common nozzle is the ‘jet tip’.  This is suitable for the vast majority of users.

It is designed for everyday use, offering a deep clean between teeth and along the gumline.

Most water flossers come with this type of tip included and available as a spare/replacement.

Some brands, notably Waterpik, offer a wider variety of nozzles.

The additional nozzles are specifically designed to offer benefits to particular users.

Examples include:

  • Orthodontic tip
    • The tip has a tapered brush on the end to help remove plaque from braces and orthodontics.  It also helps flush out bacteria and food debris from around teeth and under the gums.
  • Plaque Seeker tip
    • Designed to clean in and around harder to reach areas.  Most notably dental restorations. 3 thin bristle tufts gently access stubborn plaque around dental implants, crowns, bridges and veneers.
  • Pik Pocket tip
    • Designed to deliver water deep into periodontal pockets.  Ideal for those diagnosed with more advanced gum disease.
  • Tongue cleaner
    • The nozzle has a spoon-like shape. This traps and removes plaque from the tongue, in an effort to prevent bad breath.
  • Toothbrush tip
    • You can brush your teeth as you floss.
    • It acts like a manual toothbrush (the bristles do not move like an electric toothbrush).
  • Implant denture tip
    • Designed to reach hard to access areas. Ideal to clean around dental appliances such as fixed implant bridges and dentures.

The names and features of the tips can vary from one brand to another.

The range of nozzles and the availability tends to be best with larger brands.

For example, Fairywill only offers a jet tip only.  Those with more personalized needs will not be best served by Fairywill.

Our research suggests Waterpik offers the best range.

In fact, out of the box, Waterpik models often come with some of these different tip types.

Your dental professional can recommend specific tips if they are suitable for you.

Manufacturer guidelines suggest a nozzle such as a jet tip should be replaced every 6 months.  More specialist tips such as a plaque seeker or orthodontic tip should be renewed every 3 months.

Many people will clean jet tips with distilled vinegar. This is to extend the usable life from them and reduce the need to replace them.

The type of nozzle and its availability can affect the cost.

A jet tip from Waterpik will likely cost in the region of $5 per tip, whereas a Fairywill option will cost around $2.50.

Please note. Although nozzles are interchangeable, 1 brand might not be interchangeable with another. For example, Waterpik nozzles will not work with Sonicare.

Things to know about traveling with a cordless flosser

Different water flossers come with different power supplies.

Many will come with a power cable suitable for the 2 pin outlet in your bathroom.

Few come with replaceable batteries.  But those that do can be a real winner for some. If you do need a water flosser with replaceable batteries, we recommend the Waterpik WF-03 Cordless Freedom.

More products now come with USB cables. These are more convenient, offering more flexibility when recharging.

If you intend to travel internationally, be aware of the different power requirements.  As a quick reference guide:

  • Printed on base/plug – 100-240V
    • Where can it be used? Globally
    • Do I need a voltage convertor? No
    • Do I need a plug adapter? Subject to country
  • Printed on base/plug – 220-240V
    • Where can it be used? In countries with 200-240V (e.g. most European countries, NOT US/Canada)
    • Do I need a voltage convertor? Yes if the voltage of the country you are traveling to is less than 220V
    • Do I need a plug adapter? Subject to country
  • Printed on base/plug– 110 Volts 60 Cycles
    • Where can it be used? In countries with 110 volts (e.g. US/Canada)
    • Do I need a voltage convertor? Yes if the voltage of the country you are traveling to is higher than 110V
    • Do I need a plug adapter? Subject to country

It is worth considering protection for your water flosser when traveling.  Some, but not all come with cases included.  

More often than not, these are basic cloth pouch cases.  They offer limited protection.  What they do allow is for the flosser and all the accessories to be kept neatly together. They can help stop any excess water leaking out into a bag.

Some will also come with a separate case for the nozzles.

Do bear in mind, no water flosser we have tested, comes with any way to deactivate the buttons. It is possible that in a cloth case, a button might accidentally get pressed and the device activated.

How does the warranty work?

This can vary from one manufacturer to another and from one country to another.

Most water flossers come with a 2 year (24 month) warranty as standard.

Some brands are a little more customer centric. The best offer 3 year warranties

This will cover any faults that are not a result of user damage.

An example might be the pump failing to push water through.

If the product fails, you will need to contact the customer service department.

Many companies will require that it be returned for repair. This is usually within the country in which it was purchased.

How does dental association approval work?

Around the globe, there are many dental bodies and organizations

In fact, each country will usually have a leading panel of experts. They usually guide oral health within that country. 

These organizations are similarly aligned in their goals and approaches.

The public in particular look to them for advice on what products they should and should not be using.

The American Dental Association (ADA) and the Oral Health Foundation (UK) are 2 examples.

Each has programs that verify the safety and effectiveness of consumer products.

Consumer oral health care products are independently evaluated. This is to ensure they are safe and that the claims made are proven and not exaggerated.  Reliable scientific evidence is usually required. 

The programs are designed to give consumers peace of mind and reassurance.

Each program is run independently.  A manufacturer must apply and submit the relevant data to each organization. Only once this process has been completed will a product be awarded the ‘approved’ status of the relevant body.

The ADA issues a ‘Seal of Acceptance’. The Oral Health Foundation labels products as ‘Approved’.

Although they are separate programs, most operate by similar policies.  A product awarded the ADA seal would likely be approved by the Oral Health Foundation.


Video explainer

In the video below our chief product tester Jon Love explains the advice from our buyer’s guide and runs through our choices for the best cordless water flosser.

Best Water Flosser 2021

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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6 thoughts on “Best Cordless Water Flosser 2021”

  1. in all my searching for a portable water flosser, not one mention was made of ease in cleaning the water reservoir to avoid mold. The only comment I read regarding cleaning was in an Amazon site review with many reviews stating difficulty cleaning the portable flosser. This is the same principle of a humidifier. The reservoir must be cleaned often to prevent mold using bleach or vinegar. any comments of one to buy?

    • Hi Eileen.

      I can’t say I have found mold buildup to be a real issue. It can happen. However, keeping the door to the tank open when not in use allows it to dry out and reduce the chance of mold forming.

      We do have an article on how to clean a water flosser that would help prevent buildup. You can read it here.

  2. Waterpik water flossers battery will fail in about 12 to 13 months, so be prepared to purchase another about every year. The replacements batteries will not last but about half the time, and are difficult to replace.

    • Hi Thomas.

      Which one have you had fail on you? Many come with warranty periods longer than a year so should be repaired/replaced.

  3. I’ve used up 3 Waterpik WP-450. They just don’t last! They work great when new but after about a year the batteries fade, and they are not replaceable or repairable. I don’t think you should have to buy a new appliance every year.

    • Hi Andrew,

      Thanks for the feedback. I agree with you on not really needing to replace the product every year. It would seem they are failing outside of the warranty period, which is very frustrating.

      Have you spoken to Waterpik? If so, have they said anything?

      Given you have bought 3 and they have failed, can I presume despite your dissatisfaction at this, they do a good enough job to make it worth it for you?

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