How to Stop Grinding Your Teeth at Night (Bruxism): A Dentist's Guide

Bruxism just means clenching or grinding your teeth outside of normal chewing. It comes in two forms. Awake bruxism happens during the day, often when you're concentrating hard or stressed, and it's usually clenching rather than the back-and-forth grinding motion. Sleep bruxism happens at night, and it's the one that does the most damage, because it's involuntary and you can't consciously ease off.

Here's the mechanism. Your brain doesn't fully switch off during sleep. It cycles through stages, and grinding tends to cluster around lighter sleep stages and the transitions between them, often linked to micro-arousals, the brief, forgettable moments your brain almost wakes up. Stress and anxiety raise the muscle tension your body carries into sleep, which is why a stressful week at work often shows up as a sore jaw by the weekend. Add in things like sleep apnoea, certain medications, or simply how your bite sits together, and you've got a habit that runs entirely on autopilot.

Most people don't clock it themselves. Someone else does the noticing, either a partner who hears it, or a dentist who sees it.

Here's what to look out for:

• Jaw tightness or soreness first thing in the morning, before you've used it
• Headaches that sit around the temples, particularly on waking
• Teeth that feel more sensitive than usual, especially to cold
• Visible wear, chipping, or flattening on the biting edges of your teeth
• A bite that feels slightly "off", like your teeth don't quite meet the way they used to
• A partner mentioning a grinding sound at night, which is often the first sign anyone actually acts on

A dentist can usually spot the wear pattern on your teeth even if you've never noticed a single symptom. It's one of those things that shows up clearly on a regular check-up long before it becomes something you'd feel day to day.

Can you actually stop grinding your teeth at night? Mostly, you can reduce it. A few things genuinely help: managing stress during the day rather than letting it build, keeping a consistent sleep routine, cutting back caffeine and alcohol in the hours before bed, and some simple jaw-relaxation exercises before sleep. If your bite itself is contributing, addressing that with your dentist can also make a real difference. None of these switch grinding off completely, but they can meaningfully reduce how often and how hard you're clenching.

A few specifics worth trying:

• Wind down properly before bed. Grinding is often worse on nights when your nervous system hasn't had a chance to settle.
• Watch the caffeine and alcohol, particularly in the evening. Both can increase muscle activity during sleep, alcohol in particular tends to worsen grinding rather than relax it, despite how it feels going down.
• Try some basic jaw stretches or a warm compress before bed if you're carrying tension there.
• If stress is the main driver, that's the actual thing to work on, not just the symptom showing up in your jaw.

Here's the click moment, and it's worth sitting with for a second: none of this stops the grinding on any given night. What it can do is turn down the volume over time. In the meantime, your teeth are still taking the hit every night you're asleep, which is where the next part comes in.

While you're working on the causes, something has to protect your teeth in the meantime, and that's what a night guard actually does. It sits between your upper and lower teeth as a barrier, absorbing and spreading the force of grinding so your enamel isn't taking the full impact directly.

This is where the chemist option and a custom-made one part ways. A boil-and-bite guard from the pharmacy is better than nothing, but it's built to a generic shape, not your teeth. A poor fit means it can shift around in your sleep, feel bulky enough that you unconsciously clench harder against it, or simply not cover the areas doing the most damage. We've seen patients whose grinding actually got worse with an ill-fitting guard, because their jaw kept working against something that didn't sit right.

A custom night guard is made from an impression or scan of your own teeth, so it sits precisely, distributes force evenly across your bite, and stays where it's meant to all night. It's not a bigger, better version of the chemist one. It's a different category of protection entirely, which is really the whole reason it's worth the extra cost.

Left unmanaged, grinding wears down enamel over time, which is the hardest substance in your body but not indestructible. That wear can lead to increased sensitivity, small cracks, and in some cases genuine cracked tooth syndrome, where a tooth develops a fracture line that causes sharp pain on biting.

It's not just your natural teeth at risk either. Grinding puts real strain on any dental work you've had done. Fillings can loosen or fracture. Crowns can chip or come loose. Veneers, which are thinner than a natural tooth's enamel, are particularly vulnerable to the sideways forces grinding creates. Implants aren't immune either, since the forces travel through to the bone and the components holding everything in place. If you've invested in any of that work, an unprotected grinding habit is one of the more direct ways to shorten its lifespan.

A bit of morning jaw tightness now and then isn't necessarily urgent. A few things are worth booking in for sooner rather than later: jaw pain or headaches that are becoming a regular pattern, visible wear or flattening you can see in the mirror, a tooth that's cracked or chipped, or sleep that's genuinely being disrupted, either yours or a partner's. Any of those are your teeth (or your jaw) telling you the current situation isn't sustainable.

Dr Carlos Turk has been fitting custom night guards for over 30 years and has a straightforward way of explaining what's actually going on in your bite, without the scare tactics. If your jaw's been telling you something for a while now, it's probably worth listening to.

• Healthdirect: teeth grinding (bruxism)
• Australian Dental Association: teeth grinding
• Sleep Health Foundation Australia

This article is general information, not a diagnosis. If you're concerned about grinding or jaw pain, the most reliable next step is an assessment rather than guessing at the cause. We see patients from St Leonards and across the Lower North Shore, including at a first-visit consultation.