It is wear that works without a witness: bruxism — clenching or grinding your teeth — happens mostly during sleep, and you can do it for years without knowing. Meanwhile, the edges flatten, the enamel cracks, the teeth become sensitive. No toothpaste can stop it — let's say that upfront. But you can spot it, protect your teeth at night, and unlearn daytime clenching. Here is how.
Clenching, grinding: what are we talking about?
Bruxism takes two forms: clenching (the jaws contract, teeth still — static bruxism) and grinding (the teeth rub against each other — dynamic bruxism). Both happen mostly at night, beyond any control, and stress is a major trigger — we detailed what stress does to your mouth, including this night-time bruxism. There is also a daytime version, more discreet: jaws clenched at the screen or in traffic, without even noticing.
What bruxism damages, on the teeth side
Chewing applies brief forces; bruxism applies long, repeated, often sideways ones. On the teeth, the damage settles in slowly:
- Edges that flatten: the rims of the incisors wear down, shorten, and small shiny facets appear where the teeth rub.
- Enamel that thins faster: grinding accelerates natural wear — the edges become more translucent, and lost enamel does not grow back.
- Micro-cracks: vertical lines can appear in the enamel, and sensitivity to cold can set in with no cavity to explain it.
- Repairs that break: fillings and composites are not built for those forces; bruxism shortens their life.
And the teeth are not alone: on already fragile gums, the overload of bruxism acts as an accelerator of recession — a known aggravating factor, not a cause on its own.
How to know whether you grind
Night-time bruxism gives itself away in the morning: stiff jaws, sore temples, sensitive teeth for no reason, flattened edges — the full list of morning signs is here. Two other clues are worth attention: someone who hears you grind (the sound can be distinct), and your dentist, who recognises wear facets at a glance — it is often the dentist who announces it, before any symptom.
What actually protects
At night: the custom night guard. It is the only real protection during sleep: a guard moulded by the dentist sits between the teeth and absorbs the forces in their place. It does not stop the grinding — it puts the wear on hold, every night it is worn. It is a medical device fitted to your mouth: the dentist judges whether it is indicated.
During the day: unclench, consciously. Unlike night-time bruxism, daytime clenching can be corrected: the proper rest position is lips closed, teeth not touching, tongue on the palate. Coming back to it several times a day, especially in moments of focus or tension, gradually unlearns the reflex. In the evening, limiting caffeine and alcohol helps the jaws relax.
On the toothpaste side: protect the enamel under strain. Let's be clear, no toothpaste acts on the grinding itself. But enamel subjected to bruxism needs no extra aggression: a gentle formula with controlled abrasiveness and fluoride at the standard dose support what remains — and gentle brushing avoids adding morning wear to the night's. The full tour of what damages enamel day to day completes the picture.
The matching product: Gentle Coconut Whitening
Bruxism and abrasiveness: why you should read your toothpaste's RDA
Enamel worn down at night does not need a tube wearing it down by day. A toothpaste's abrasiveness is measured by its RDA index: the higher it is, the harder the paste polishes — useful against stains, pointless on edges already thinned by grinding. If you clench or grind, pick a low- or moderate-abrasiveness formula for everyday use and keep more polishing pastes for occasional use. Our page on the RDA index gives the benchmarks and the known values, brand by brand.
Technique matters as much as the tube: a soft-bristled brush, held like a pen rather than in a fist, and small strokes without pressing — an electric brush with a soft head helps those who scrub too hard. And if cold already stings, it means dentine is showing through worn enamel: our article on teeth sensitive to cold explains what to do, and the one on fragile enamel which toothpaste to favour while you wait for your night guard.
Your questions about bruxism
Is a pharmacy night guard enough?
Boil-and-bite universal guards exist, but they are not adjusted to your bite — and a poorly fitted guard can bother more than it protects. It is a question to settle with the dentist, not in the pharmacy aisle.
My child grinds their teeth at night: should I worry?
Bruxism in children is common and often transient, particularly while teeth are coming through. It is worth mentioning to the dentist at a check-up — they will judge whether follow-up is needed.
Can you stop grinding your teeth?
Night-time bruxism is not voluntary: you do not "decide" it away — you protect the teeth from it and act on its triggers, stress first. Daytime clenching, on the other hand, genuinely can be unlearned with postural awareness.
Can bruxism loosen teeth?
On its own, no — but it worsens an already fragile gum situation and can accelerate existing recession. If your gums are receding, the question of loosening teeth is covered here — and bruxism is one of the aggravating factors to cut.
In short
Bruxism wears teeth down in silence: flattened edges, cracked enamel, sensitivity — and lost enamel does not come back. You spot it by the morning signs, the sound a partner hears, or the dentist's examination. Night protection is the custom guard; by day, you learn to unclench; and at the sink, gentleness and fluoride protect what the night strains. No tube replaces the dentist on this ground — our role stops at the enamel, theirs begins at the jaw.