How to Use Interdental Brushes: A Gentle UK Guide for Sensitive Gums

Short answer: use an interdental brush by choosing the right size for each gap, easing it gently through at a slight angle to the gumline, and moving it in and out a few times — never forcing it. Done daily and gently, it is the most effective way to clear plaque a toothbrush leaves behind, and it suits fragile or bleeding gums when the size is right.

Whether you are cleaning your own teeth or helping an older relative, the same principles apply: the goal is gentle, thorough coverage, especially of the back teeth a normal brush struggles to reach.

Key points: using interdental brushes

• Size per gap — front teeth usually need a smaller brush than back molars.
• Insert gently at a slight angle; if it needs force, the brush is too big.
• Some bleeding in the first week is normal for inflamed gums; persistent bleeding needs a check.
• For dentures, bridges or implants, ask your dentist which size and type to use.

Why interdental cleaning matters

Toothbrush bristles cannot reach the contact points between teeth, and plaque collects there within hours. Interdental brushes — small tapered brushes on a handle — sweep that plaque out far better than rinsing alone. NHS guidance recommends cleaning between teeth every day, and for many people a brush is easier to handle than floss.

How to use interdental brushes, step by step

1. Choose the right size

Brands such as TePe and Oral-B sell colour-coded sizes. The right brush slides in with gentle resistance and fills the gap without bending the wire sharply. Buy a mixed pack and test each space — front teeth often need a smaller size than molars. Your hygienist can mark the sizes for each gap at your next visit.

2. Insert gently at an angle

At a mirror with good light, ease the brush in from the outer side, angled slightly towards the gumline so the bristles meet the tooth surface. Push through gently until you feel the contact point, then stop. If it will not go without force, switch to a smaller size rather than pushing.

3. Move it in and out

Slide the brush in and out two or three times along the gap. Do not saw sideways across the gum. Repeat for every space, including behind the last molars where many people stop short.

4. Rinse and store

Rinse under running water, check for bent wires or splayed bristles, and store dry. Replace a brush when the bristles flare or after about a week of daily use.

A gentle method for sensitive or bleeding gums

If your gums are fragile and bleed at the slightest touch, the instinct is to avoid the area — but that lets plaque build and makes bleeding worse. The fix is the right size and a light touch, not avoidance. Expect a little bleeding in the first week or two as inflammation settles; if it persists beyond that, see a professional, because it usually signals gum disease that needs assessment.

Helping an older relative clean between teeth

Caring for a parent whose hands shake or who has arthritis brings its own challenges: gripping a small handle and reaching the back teeth can be hard, and their gums may be delicate. Choose a brush with a longer or angled handle for grip, work slowly with good light, and start with the gentlest technique. If they have dentures, a bridge or implants, check with their dentist first about which tools are safe around the restoration. Pairing daily interdental cleaning with an ultrasonic teeth cleaner can help keep visible surfaces fresh, while our plaque removal guide covers the wider routine.

Interdental brushes vs floss

Both clear plaque between teeth. Floss suits very tight contacts; interdental brushes are often faster and more thorough in open or triangular gaps, and easier for anyone with reduced dexterity. Using either consistently beats debating which is better while doing neither.

The DPR Crelé ultrasonic teeth cleaner kit

The DPR Crelé ultrasonic teeth cleaner kit complements interdental cleaning by lifting soft plaque and surface stains from the visible faces of teeth. It offers multiple modes so you can start on the gentlest setting — helpful for delicate gums — with an IPX6 waterproof body, USB charging and replaceable heads. It is £29.38 with free UK delivery, 30-day returns and a 12-month warranty, rated 4.8 out of 5 from 300 reviews. It complements interdental brushing rather than replacing it.

Frequently asked questions

How do you use interdental brushes without hurting your gums?

Choose the right size for each gap, ease the brush in gently at a slight angle to the gumline, and move it in and out a few times without forcing it. If it will not slide in without pressure, switch to a smaller size. A light touch protects the gums.

What size interdental brush should you use?

There is no single size — front teeth usually need a smaller brush than back molars. Buy a mixed pack, test each gap, and let your hygienist mark the right size per space at your next visit.

Can you use interdental brushes on dentures, bridges or implants?

Often yes, but ask your dentist first. Restorations need specific sizes and sometimes specialised brushes, and the right advice avoids damaging the work or the surrounding gum.

How often should you replace an interdental brush?

Replace it when the bristles splay or the wire bends, or after roughly a week of daily use. A worn brush cleans poorly and can scratch enamel, and brushes should never be shared between people.