What Is Bruxism (Teeth Grinding)?

You wake up with a dull ache along your jaw, a headache that sits around your temples, and no clear memory of doing anything to earn either. If that pattern sounds familiar, bruxism may be part of the story. Bruxism is the habit of clenching or grinding your teeth — most often during sleep, when you can't catch yourself doing it, though some people clench during the day too, usually without noticing. The short video at the top of this page is built around exactly that picture: grinding teeth while sleeping, the jaw joint it strains, and the night guard many dentists reach for. It runs just over two minutes.

Because most grinding happens out of sight, a few stubborn myths have grown up around it. Sorting them out is a good way to understand what's actually going on.

Myth: if you ground your teeth, you'd know

Fact: most people find out second-hand. A partner hears the grinding at night — it's surprisingly loud — or a dentist spots the evidence first: flattened, worn-down chewing surfaces, tiny cracks, or teeth that have become sensitive as the enamel thins. Morning clues help too. A tight, tired jaw, soreness in the chewing muscles, and those temple headaches all point the same way, because your jaw muscles have effectively been working a night shift.

Myth: it's just a bad habit, so willpower fixes it

Fact: sleep bruxism isn't something you choose, so you can't simply decide to stop. It tends to travel with stress and broken sleep, and it often eases and flares over time rather than switching off. Daytime clenching is a little different — there, noticing the habit is half the battle, and many people are surprised how often they catch their teeth pressed together while concentrating. But the night-time kind needs a different approach: protect the teeth first, then look at what's feeding it.

Myth: the damage is only about worn teeth

Fact: the teeth are only part of it. The force of grinding lands on the temporomandibular joint too — the hinge just in front of each ear that connects your jaw to your skull and lets you talk, chew, and yawn. When that joint and its muscles are overworked, the result can be jaw pain, stiffness, clicking, or an ache that spreads toward the ear. Our second video, "Temporomandibular joint dysfunction (TMJD)", walks through how that hinge works and what happens when it stops working smoothly.

So what does a dentist actually do?

The check itself is straightforward: a look at the wear pattern on your teeth, a feel of the jaw muscles, and questions about your mornings. The most common protection is a custom night guard — a close-fitting cover worn over the teeth during sleep, like the one the anchor video centres on. It doesn't stop the clenching, but it takes the force itself, sparing the enamel and easing the load on the joint. Looking after the surrounding territory matters too: grinding and gum trouble often show up in the same mouths, which is why our guide to gingivitis and gum disease is worth a read alongside this one.

A cracked or broken tooth, pain that keeps returning, a jaw that locks or won't open fully, or wear that seems to be speeding up are all reasons to book the appointment sooner rather than later — those are problems a guard alone won't settle, and they deserve an in-person look.

Frequently Asked Questions

Is bruxism the same as a TMJ disorder?

Not quite. Bruxism is the grinding or clenching habit itself; a TMJ disorder is a problem with the jaw joint or its muscles. The two overlap often — grinding can strain the joint, and a sore joint can change how you hold your jaw — but they are separate diagnoses, and many grinders never develop joint trouble.

Can children grind their teeth too?

Yes, teeth grinding is fairly common in children, especially during sleep, and it often fades as they grow. A dentist can check at routine visits whether the wear is worth watching or treating, so mention it if you hear grinding at night.

Will a night guard stop me grinding?

Probably not — that's not its job. A guard protects the teeth from the force and reduces the strain passed to the jaw joint and muscles. Whether the grinding itself settles often depends on the things feeding it, like stress and sleep quality, which is worth discussing at the same appointment.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about bruxism, not medical advice and not a diagnosis. Tooth pain, a cracked tooth, or jaw pain or locking should be assessed by a dentist who can examine your teeth and jaw.