Cleaning between teeth: floss, interdental brushes or a water flosser?

Give between-teeth cleaning a clear place in your daily routine. Floss, interdental brushes and water flossers offer different ways to approach it; your choice starts with the spaces you need to clean and what you can comfortably manage.

This guide helps you compare the options and prepare a specific question for your dentist or hygienist. It does not rank one tool as the right answer for everyone.

On this page: Why clean between teeth? · The main tools · Fit and handling · What research says · Making it practical · Questions to ask

Between-teeth cleaning has its own job

The American Dental Association recommends cleaning between teeth once a day. Its guidance explains that toothbrush bristles alone cannot effectively clean all the tight spaces between teeth.

That gives you a useful way to organise a routine: think about the surfaces your toothbrush reaches, and then the spaces that need a separate approach. A new toothbrush, extra brushing features or a particularly fresh feeling does not answer the second question.

Between-teeth cleaning also has limits. The US National Institute of Dental and Craniofacial Research explains that hardened plaque, called tartar, needs professional cleaning. Trying harder with a home tool is not a substitute for having a deposit assessed.

What are the main options?

Dental floss or tape

Floss is a flexible strand used to clean alongside teeth. The ADA notes that it may suit tight spaces. A holder changes how you grip the floss, which can make it easier to handle for some people.

When comparing options, separate the strand from the handle. If your difficulty is wrapping floss around your fingers, a different grip may be the relevant question. If the strand catches or repeatedly shreds in one place, tell your dental professional rather than forcing it through.

Interdental brushes

These are small brushes made for the spaces between teeth. The ADA describes a range of sizes, so the pack colour or appearance alone is not a sufficient guide to fit.

Ask for a demonstration and a clear note of the size or sizes recommended for you. If more than one size is advised, ask which areas each is for. Keeping that information with your shopping list is more useful than trying to remember a handle colour across different brands.

Water flossers and other handling aids

The NIDCR's practical oral-hygiene guide includes water flossers, floss holders, threaders and interdental brushes among options for people who find ordinary floss difficult. A water flosser directs a stream of water; a threader helps guide floss through spaces.

If you are considering a powered tool, look beyond the headline feature list. Can you comfortably hold it, reach its controls and follow the cleaning directions? Is there a suitable place to use and store it? Those everyday questions help you assess whether it fits the plan your dental professional recommends.

Fit and technique matter more than buying a whole collection

Begin with the obstacle you actually have. “I cannot reach the back teeth comfortably” is more actionable than “I need a better flosser”. “This space is awkward around my bridge” gives your hygienist a different problem to solve from “I keep forgetting”.

Use a short note to distinguish:

• Access: which area is difficult to reach?
• Handling: is the problem grip, visibility, control or keeping the tool steady?
• Fit: has someone checked which tool and size suit the space?
• Understanding: could you repeat the demonstrated technique confidently at home?
• Routine: do you have the right supplies where you need them?

For floss, NIDCR advises gentle entry and curving it around the side of the tooth rather than forcing it into the gum. If a written description is hard to translate into movement, ask to practise while a dental professional watches and gives feedback.

What can the research tell us?

A Cochrane review of home interdental-cleaning devices included 35 studies involving 3,929 adults. Adding floss or interdental brushes to brushing may improve some measures of gum inflammation or plaque. However, evidence certainty was low to very low, studies were mostly short term, none assessed decay, and the observed effects may not be clinically important.

Two conclusions would stretch those findings: that between-teeth cleaning is pointless, or that one device has proven superior long-term protection for everybody. The review supports a more careful conversation about what has been measured and what remains uncertain.

A recommendation for daily care and uncertainty about the size of a research effect can coexist. For your own routine, ask your dental professional how their recommendation relates to your tooth spacing, dental work and ability to use the tool.

For more help interpreting a study, our evidence-reading guide uses toothbrush examples to explain comparisons, outcomes and limitations.

Make the agreed routine easier to carry out

Once you have a suitable approach, decide when the daily step fits, where your kit will be and what could get in the way. For example, if settling down for the evening makes you forget, consider a bathroom visit you already make. If a late shift changes where you will be, plan access to your own supplies before leaving.

Published guidance for dental teams includes identifying barriers and planning for setbacks. Use any difficulty to adjust the setup or ask for help, while keeping your agreed cleaning instructions unchanged.

The ADA accepts cleaning between teeth before or after brushing when cleaning is thorough. Follow any more specific order your dental professional has given you. The choice should not become a reason to keep delaying the task.

Follow each tool's directions for cleaning, reuse and replacement. A reusable powered unit, its tip, a small brush and a length of floss are different components; do not apply one item's instructions to all of them.

If you miss a day, resume the agreed routine. Avoid making up your own more forceful technique as compensation.

Five useful questions for your next appointment

1. Which spaces should I clean with floss, and would a different tool suit any areas?
2. If you recommend interdental brushes, which sizes do I need and where?
3. Can you demonstrate the technique, then check that I can repeat it?
4. Do my bridge, braces, implants or other dental work change the approach?
5. What should I do if a particular area hurts, bleeds or remains difficult to clean?

Be specific about what you are finding difficult. Persistent pain, bleeding or repeated problems deserve dental advice rather than a series of new purchases.

This article is general adult oral-health information, not a diagnosis or personalised treatment plan.