What Is the Correct Way to Floss Between Teeth for Better Oral Hygiene

Most people know they should floss, yet research consistently suggests that a significant proportion of adults in the UK either floss infrequently or not at all. Even among those who do floss, the technique used is often incorrect, which limits how effective the process can be.

Understanding how to floss between teeth properly is not simply about going through the motions. The mechanics behind the technique matter — where you position the floss, how you guide it, how you move it, and how you remove it all influence whether you are genuinely removing plaque from the places a toothbrush cannot reach.

This article explains the correct approach in practical terms, addresses common difficulties, and helps you understand how interdental cleaning fits into a broader oral hygiene routine.

Direct Answer: The correct way to floss between teeth is to use approximately 45 cm of floss, wind most of it around the middle fingers, and guide a short section between teeth using the index fingers and thumbs. Curve the floss into a C-shape around each tooth, slide it gently beneath the gum line, and move it up and down before moving to a clean section of floss for each tooth gap.

Flossing is a method of interdental cleaning — the process of removing plaque, food debris and bacteria from the spaces between teeth where a toothbrush bristle cannot reach. These spaces, known as interproximal areas, account for a substantial portion of each tooth's surface.

Dental plaque is a soft, sticky film of bacteria that forms on teeth throughout the day. When it is not removed regularly, it can harden into tartar, irritate the gum tissue and, over time, contribute to conditions such as gingivitis or more advanced periodontal disease. Cleaning between your teeth helps address these areas directly.

The NHS and a broad range of dental organisations recognise interdental cleaning as an important component of daily preventive dental care. While the strength of evidence for flossing specifically continues to be discussed in academic literature, removing plaque from interdental surfaces is widely supported as beneficial for gum health and the prevention of tooth decay in these areas.

Learning how to floss teeth properly begins with understanding not just the steps, but the reasoning behind each one.

Use approximately 40–45 cm of floss — roughly the distance from your hand to your elbow. This length may seem generous, but it allows you to use a fresh, clean section of floss as you move from one gap to the next. Reusing the same section transfers bacteria from one area to another, which defeats the purpose.

1. Wind most of the floss around the middle finger of one hand, and the remainder around the middle finger of the opposite hand. The middle fingers act as spools, allowing you to feed and retrieve floss cleanly.

2. Hold a short working section of approximately 2–3 cm taut between your index fingers and thumbs.

3. Use the index fingers to guide the floss in the lower teeth and the thumbs to guide it in the upper teeth, or a combination that feels stable and controlled.

This grip provides the control needed to manoeuvre the floss accurately without snapping it into the gum tissue.

Many people find that floss catches, shreds or snaps against their gums when teeth are closely spaced. The key is a gentle sawing or rocking motion — moving the floss side to side in small increments as you guide it downward. Do not apply downward force alone, as this causes the floss to snap through the contact point and strike the gum sharply.

Work slowly. If the floss consistently shreds in a particular area, this may indicate a rough filling edge or a dental issue worth discussing with your dentist.

Once the floss has passed through the contact point between two teeth, it is important not to simply pull it straight back out. This is a very common flossing mistake that leaves plaque on the tooth surfaces.

Instead:

1. Curve the floss into a C-shape around one tooth.

2. Slide it gently up and down against the tooth surface, from just beneath the gum line upward.

3. Reshape the floss into a C around the adjacent tooth.

4. Repeat the up-and-down movement against that tooth surface.

5. Advance to a clean section of floss before moving to the next gap.

This C-shape technique ensures that both tooth surfaces in each gap are cleaned, not just the floss path itself.

Sliding the floss slightly beneath the gum line — into the sulcus, the natural shallow groove where the gum meets the tooth — is an important part of effective flossing. Aim to guide the floss 1–2 mm below the visible gum edge.

This does not mean forcing the floss deeply into the gum tissue, which can cause unnecessary trauma. Gentle pressure is sufficient. The floss should curve around the tooth and follow its natural contour.

Removing the floss incorrectly can undo careful technique. Rather than pulling the floss straight upward or outward — which can cause it to snap against gum tissue — use the same side-to-side rocking motion you used to insert it. Ease it out gently by alternating small lateral movements as you bring it back through the contact point.

Dental guidance commonly recommends flossing once daily. The reasoning is that plaque begins to mature and becomes more difficult to disrupt after roughly 24 hours, so a daily interdental clean helps to prevent it from accumulating in areas the toothbrush cannot reach.

The specific time of day is less important than consistency. What matters most is that it becomes a reliable part of your routine.

This question is more nuanced than it might appear. Some evidence suggests that flossing before brushing may be beneficial, because it loosens plaque and food debris from between the teeth, allowing fluoride from toothpaste to penetrate those areas more effectively during brushing.

However, the most important factor is that you floss at all — and that you do so correctly. If you find it easier to floss after brushing, that remains a worthwhile habit. Discuss the sequencing question with your dental hygienist, who can advise based on your individual circumstances.

Even people who floss regularly can inadvertently make errors that reduce its effectiveness. Some of the most frequent include:

• Snapping the floss into the gums — caused by applying too much downward pressure without a lateral guiding motion.

• Skipping the C-shape — pulling the floss straight through without curving it around each tooth surface.

• Reusing the same section — failing to advance to a clean portion as you move between gaps.

• Rushing — not allowing enough time to move the floss up and down adequately against each surface.

• Missing the gum line — stopping at the contact point and not sliding gently beneath the gum edge.

• Flossing inconsistently — doing it occasionally rather than as part of a daily routine.

• Avoiding difficult areas — skipping back teeth because they are harder to reach.

Being aware of these habits is often the first step to improving your technique.

If your gums bleed during flossing, this can feel alarming, but it is a relatively common experience when starting or restarting a flossing routine. Gum tissue that has become inflamed due to plaque accumulation — a condition often associated with gingivitis — tends to be more sensitive and prone to bleeding.

In many people, consistent and gentle flossing over a period of one to two weeks may lead to a reduction in gum bleeding as the tissue becomes healthier. However, if bleeding is heavy, persistent beyond a few weeks, or accompanied by pain, it is advisable to seek a professional assessment from a dentist or dental hygienist. Persistent bleeding can sometimes indicate an underlying gum condition that warrants clinical attention.

Dental floss is not universally suitable or comfortable for all patients, and this is widely acknowledged in clinical guidance. Individual factors — including the spacing of teeth, the presence of dental restorations, manual dexterity and personal preference — all influence which interdental cleaning method may be most appropriate.

• Waxed floss tends to slide more easily through tight contacts and is less likely to shred.

• Unwaxed floss may create a slight squeaking sound against clean tooth surfaces, which some people find reassuring as confirmation that teeth are clean.

• Dental tape is broader and flatter, which can feel more comfortable for people with wider spaces between teeth or sensitive gum tissue.

Interdental brushes — small brushes on a flexible wire — are often recommended for people with larger gaps between teeth, those with bridgework, or individuals who find floss difficult to use effectively. Research, including guidance from organisations such as the British Society of Periodontology, suggests that interdental brushes can be effective at removing plaque, particularly where there is some degree of gum recession creating wider interdental spaces.

It is worth noting that the correct size of interdental brush matters. An interdental brush that is too small for the space will not clean effectively; one that is too large may cause discomfort. A dental hygienist can help identify the appropriate size for each individual space.

• Water flossers (oral irrigators) use a pressurised stream of water to flush debris from between teeth and around the gum line. They can be a useful adjunct, particularly for people wearing orthodontic appliances or those with limited dexterity, though they are generally considered supplementary rather than a complete replacement for mechanical cleaning.

• Floss picks and floss threaders can make it easier to reach back teeth or to thread floss beneath dental bridges.

Do not assume that a single approach suits everyone. Your dentist or dental hygienist is well-placed to advise on the most effective method for your specific dental anatomy and any restorative work you may have.

If you have dental bridges, implants, orthodontic brackets or crowns, flossing requires some additional consideration.

• Dental bridges: Because bridges span across a gap where a tooth has been removed, conventional floss cannot be threaded between the supporting teeth in the usual way. Floss threaders or superfloss — a type of floss with a stiffened end — can be used to guide the floss beneath the bridge pontic (the false tooth) to clean the gum area underneath.

• Dental implants: Cleaning around implants is important for long-term implant health. Floss, interdental brushes and water flossers can all play a role; your implant care team will advise on the most appropriate approach for your situation.

• Orthodontic appliances: Fixed braces make conventional flossing more challenging, and floss threaders or orthodontic floss are typically recommended. Water flossers can also be a practical supplement during orthodontic treatment.

Flossing is one component of a complete preventive routine, not a standalone solution. The NHS advises brushing teeth twice a day with a fluoride toothpaste — last thing at night and at one other time during the day — as the foundation of oral hygiene.

Interdental cleaning, whether through flossing or an alternative method, complements brushing by addressing the surfaces between teeth that bristles cannot reach. Together, these practices help to reduce the build-up of plaque across all tooth surfaces.

Regular appointments with a dentist and dental hygienist remain important, even for those who maintain a thorough home routine. Professional cleaning removes tartar — calcified plaque that cannot be removed by brushing or flossing alone — and allows for early detection of any developing concerns. You can learn more about what to expect from a routine hygiene appointment at Wimpole Dental.

A balanced diet, adequate hydration and avoiding frequent sugary snacks also contribute to a broader approach to preventing tooth decay and maintaining gum health over the long term.

If you are uncertain whether your flossing technique is effective, a dental hygienist can demonstrate the correct method chairside, using your own mouth as the reference point. This kind of personalised instruction is often far more useful than written guidance alone, particularly for those who find certain areas of the mouth difficult to reach.

If you have not visited a dentist recently and would like a comprehensive assessment of your oral health, including the condition of your gum tissue and any areas where plaque may be accumulating, a new patient examination can provide a clear and professional picture of where you stand and what, if anything, may benefit from attention.

The information provided in this article is intended for general educational purposes only. It reflects broad clinical understanding and publicly available dental health guidance at the time of writing, but it does not constitute personalised dental advice, clinical assessment or a treatment recommendation. Every individual's oral health circumstances are unique, and the content of this article may not apply equally to all readers.

If you have concerns about your gum health, experience persistent bleeding when cleaning between your teeth, notice changes in your mouth or are unsure which interdental cleaning method is appropriate for your dental anatomy or restorations, you are encouraged to seek professional advice from a qualified dentist or dental hygienist. Only a clinical professional who has examined your mouth can provide guidance tailored to your specific needs. This article is not a substitute for that professional relationship.

Written Date: 18 August 2026 Next Review Date: 18 August 2027