How to clean and care for an electric toothbrush

Why cleaning your brush matters

It's easy to assume a toothbrush cleans itself — it's covered in toothpaste twice a day, after all. In reality, the parts you don't see tell a different story. Toothpaste residue, water and bacteria collect in the join between the head and the handle, and the warm, damp environment of a bathroom encourages mould and that telltale pink or black residue to form. None of this is dangerous if you keep on top of it, but a neglected brush becomes grubby, can start to smell, and harbours bacteria you'd rather not put back in your mouth. A couple of minutes of care a week prevents all of it.

The daily routine

After each brush, rinse the bristles under running water for a few seconds to clear away toothpaste and debris. Then — this is the bit people forget — rinse the metal stem beneath the head and the bottom of the head itself, where toothpaste tends to gather. Give the head a firm shake to fling off excess water, wipe the handle dry with a towel or tissue, and stand the brush upright in its holder so any remaining water drains downwards rather than pooling in the join. That's it: thirty seconds that prevent most build-up before it starts.

The weekly deep clean

Once a week, take the head off the handle. This exposes the metal stem and the inside of the head connector — the two spots where grime and the dreaded pink residue accumulate. Wipe the stem with a damp cloth, and clean inside the head connector with a cotton bud if needed. Rinse the head separately, including the underside, and leave both parts to air-dry fully before reassembling. If you spot limescale on the handle or charger, a cloth dampened with a little diluted white vinegar will lift it; wipe it clean afterwards. Never submerge the handle in water — it contains the motor and battery and is only splash-resistant, not waterproof.

How to stop your brush head going mouldy

Mould and pink residue form for one reason: water sits trapped between the head and the handle stem and never dries out. Prevent it with three habits. First, after every brush, pull the head up slightly and shake both parts dry. Second, store the brush upright so gravity drains the water down and away from the join, rather than lying it flat where water pools. Third, remove the head completely once a week to let the connection dry out properly. If a head has already discoloured on the inside, don't try to scrub it clean — replace it. A clean head is cheap; a mouldy one isn't worth the risk.

When to replace the brush head

Replace the head every three months, or sooner if the bristles splay outwards or the colour indicator on the bristles fades. There's a real reason for this beyond hygiene: worn, bent bristles clean far less effectively and can be harsher on your gums, so an old head undoes much of the benefit of an electric brush. Setting a reminder, or buying heads in multi-packs so you always have a spare, makes it easy to stay on schedule. It's one of the cheapest ways to keep your brushing genuinely effective.

Looking after the battery and charger

Modern electric toothbrushes use lithium-ion batteries, which prefer to be topped up rather than run completely flat and recharged from empty every time. There's no need to leave the brush on the charger permanently; charge it when it runs low and store it off the charger between top-ups. Keep the charger dry and free of limescale, and if you travel, use the supplied case rather than throwing a bare brush into a wash bag, where it can switch on or get knocked about. Treated sensibly, the battery in a good brush will stay healthy for years.

A note on hygiene if you've been ill

If you've had a cold, flu or a mouth infection, give the head an extra rinse and a thorough dry once you're better — and if it's near the three-month mark anyway, that's a sensible moment to swap it for a fresh one. You don't need special disinfectants or "sterilising" gadgets for everyday use; rinsing, drying and replacing on time keep a brush perfectly hygienic.