Water Flosser vs Flossing: Which Is Better for Your Teeth?

If you have ever been told by your dentist that you need to floss more, you are not alone. You may have wondered whether a water flosser could be an easier alternative.

These devices have surged in popularity in recent years, but do they actually work as well as traditional floss? Here is what the evidence says and who benefits most.

What Is a Water Flosser?

A water flosser (also known as an oral irrigator) is an electrical device that directs a thin, pulsating stream of water between your teeth and along the gum line. The pressurised water dislodges food debris, bacteria, and loose plaque from areas that a toothbrush cannot reach easily.

At the same time, the pulsating action massages the gums, which can help improve blood flow and reduce inflammation.

The most well-known brand is Waterpik, though there are now many alternatives on the market at various price points. They are not a new invention. Oral irrigators have been used in dentistry since the 1960s. Modern consumer devices have become much more affordable and user-friendly.

Water Flosser vs Traditional Floss: What Does the Evidence Say?

This is where it gets nuanced. Both methods have their strengths, and the best choice depends on your individual situation.

Research consistently shows that water flossers are effective at reducing gum bleeding and inflammation. Several studies have shown them to be as effective as, or even slightly more effective than, string floss at reducing gingivitis.

However, there is an important limitation. Traditional string floss physically wraps around the tooth and scrapes plaque from the contact point. Water flossers may not be as effective at removing well-established plaque from these tight spots. This is why most dental professionals recommend using a water flosser as a complement to, rather than a complete replacement for, some form of interdental cleaning.

Want personalised advice on your cleaning routine? Find a hygienist near you for a professional assessment.

Who Benefits Most from a Water Flosser?

While anyone can use a water flosser, certain groups benefit particularly.

• People with braces: Cleaning around orthodontic brackets and wires with string floss is notoriously difficult and time-consuming. A water flosser makes it significantly easier to flush debris from around brackets, under wires, and between teeth. See our braces vs Invisalign guide for more on orthodontic options.
• People with implants: The area around dental implants needs careful cleaning to prevent peri-implantitis (inflammation around the implant). Water flossers are gentle yet effective at cleaning around implant crowns and abutments.
• People with bridges or crowns: Traditional floss cannot pass through the joined sections of a bridge. Water flossers can clean underneath and around these restorations effectively.
• People with dexterity issues: Those with arthritis, carpal tunnel syndrome, Parkinson's disease, or any condition that makes manipulating string floss difficult often find a water flosser much easier to handle.
• People with gum disease: The combination of plaque removal and gum massage can be particularly beneficial for managing gingivitis and early periodontitis. The water pressure can also help flush bacteria from shallow gum pockets.
• People who hate flossing: If you genuinely cannot bring yourself to use string floss, a water flosser you use consistently is far better than nothing.

How to Use a Water Flosser Properly

Using a water flosser correctly makes a significant difference to its effectiveness. Here is a step-by-step guide.

1. Fill the reservoir with lukewarm water. Some people add a small amount of antibacterial mouthwash, though plain water is fine.
2. Start on the lowest pressure setting and increase gradually as your gums adapt. This is especially important when you first start using one.
3. Lean over the sink with your mouth slightly open to let water flow out. It can be messy at first until you get the hang of it.
4. Aim the tip at the gum line at a 90-degree angle to the tooth, pausing briefly at each gap between teeth.
5. Work systematically around your mouth. Outside surfaces first, then inside surfaces, pausing at each space for a couple of seconds.
6. Spend about 60 to 90 seconds on the full process. Most countertop models have enough water for this.
7. Use before or after brushing. The order does not matter much, though some evidence suggests using it before brushing may help fluoride from your toothpaste reach more surfaces.

Types of Water Flosser and What to Look For

There are two main formats to choose from, each with their own advantages.

Countertop Models

These sit on your bathroom counter and have a large water reservoir (typically enough for 60 to 90 seconds of continuous use). They tend to be more powerful, offer more pressure settings, and come with multiple nozzle tips. The trade-off is that they take up counter space and are not portable.

Cordless / Portable Models

Battery-powered or rechargeable, these are compact and travel-friendly. They have a smaller water reservoir (usually enough for 30 to 45 seconds) and may offer fewer pressure settings. They are ideal if counter space is limited or you travel frequently.

How Much Do Water Flossers Cost in the UK?

Water flossers are available across a broad price range. Here is what you can expect to pay.

Unlike electric toothbrushes, the ongoing cost is very low. Replacement nozzle tips are inexpensive and only need changing every three to six months.

Limitations to Be Aware Of

Water flossers are a useful tool, but it is important to understand what they cannot do.

• They do not replace brushing: A water flosser cleans between teeth and along the gum line, but it does not clean the main surfaces of your teeth. You still need to brush twice daily with a fluoride toothpaste.
• They may not remove all plaque from tight contacts: The water stream may not physically dislodge established plaque from the tightest contact points between teeth as effectively as string floss or interdental brushes.
• They can be messy: There is a learning curve. Expect some water spray until you develop your technique.
• They need power: Countertop models need a plug socket. Cordless models need regular charging.

What About Interdental Brushes?

It is worth mentioning interdental brushes (such as TePe) as an alternative. Many dental professionals now recommend these over string floss as the primary interdental cleaning tool, as they are often easier to use and there is good evidence for their effectiveness.

If you have gaps between your teeth that a small brush can fit into, interdental brushes may be the most effective option. However, they do not fit into very tight spaces, which is where string floss or a water flosser can complement them.

Your dentist or hygienist can recommend the right combination for your mouth. For more on choosing an electric toothbrush to pair with your interdental routine, see our dedicated guide.

Frequently Asked Questions

Can a water flosser replace flossing?

Water flossers are excellent at flushing out food debris and reducing gum inflammation, but most dental professionals agree they do not fully replace traditional floss or interdental brushes for removing plaque from tight contact points. However, if you find it impossible to use string floss, a water flosser is significantly better than no interdental cleaning at all.

Are water flossers worth it?

For many people, yes. They are particularly beneficial for those with braces, dental implants, bridges, or crowns. People with dexterity issues also find them much easier to use than traditional floss. At £30 to £100 for a good model, they are a worthwhile investment if they help you clean between your teeth more consistently.

How often should I use a water flosser?

Once a day, ideally as part of your evening routine. If you have braces or gum disease, your dentist may recommend twice daily. Consistency matters more than frequency.

Do water flossers damage gums?

When used correctly, water flossers do not damage gums. Start on the lowest pressure setting and increase gradually. If your gums bleed initially, this is usually a sign of existing gum inflammation, not damage from the device. Bleeding should reduce within one to two weeks of regular use.

Can I put mouthwash in a water flosser?

Check your model's instructions first. Most manufacturers recommend lukewarm water only, as mouthwash can damage seals and internal components over time. It is generally better to use mouthwash separately after water flossing. See our mouthwash guide for more on choosing the right product.

Water flosser vs interdental brushes: which is better?

Interdental brushes are often considered the gold standard because they physically scrub plaque. But they only work if the gaps between your teeth are large enough. Water flossers work well for tight spaces, around braces, and under bridges. Many dentists recommend combining both for the most thorough clean.

Are water flossers good for gum disease?

Yes. Research shows they can reduce gum bleeding, inflammation, and periodontal pocket depth when used alongside brushing. They are a useful tool for managing gingivitis and early periodontitis. For established gum disease, professional treatment is still essential. See our gum disease guide for more.

Which is the best water flosser in the UK?

The Waterpik Aquarius is widely considered the best countertop model for most people. For cordless options, the Waterpik Cordless Advanced and Panasonic EW-DJ40 are popular. Budget options from Bitvae and Nicwell also perform well. The best choice depends on your budget, counter space, and whether you need portability.