Grinding your teeth in your sleep (bruxism): causes, effects and what helps

What does grinding your teeth in your sleep mean?

Grinding your teeth in your sleep is known medically as bruxism. It's the forceful sliding of your teeth and molars against each other, producing that typical grinding sound. It happens unconsciously, mostly at night, and with surprising force: far more than you'd exert while chewing during the day.

Bruxism has two forms, which often occur together:

• Grinding: you slide your teeth and molars sideways against each other. This mostly happens during sleep.
• Clenching: you press your jaws hard together without sliding. This happens both at night and during the day, often during periods of tension or concentration.

In children, teeth grinding is common and usually resolves on its own. In adults it can persist, and then it's good to know where it comes from and what you can do about it.

How do you know if you grind your teeth at night?

Because it happens in your sleep, you often don't notice it yourself. These signs point to it:

• a sore or stiff jaw when you wake up
• headaches around your temples in the morning, or unexplained earache
• sensitive or worn-down teeth and molars
• a grinding sound your partner notices at night
• daytime fatigue, because the grinding disrupts your sleep
• tense jaw muscles, sometimes visible as thickened chewing muscles

If you suspect you grind your teeth, your dentist can confirm it. They often recognise the characteristic wear on your teeth right away.

What causes teeth grinding?

The exact cause of bruxism isn't always identifiable, but several factors have been shown to play a role. It's often a combination.

• Stress and tension. By far the best-known factor. Bottled-up tension, worries, or a busy period express themselves at night as grinding. Your jaw literally processes the stress of the day.
• Sleep problems and sleep disorders. Bruxism is linked to restless sleep and often occurs alongside sleep apnoea and snoring. The grinding happens during brief, unconscious awakenings.
• Heredity. An estimated 40 to 60% of cases involve a genetic predisposition. If bruxism runs in your family, the risk is higher.
• Lifestyle. Smoking, alcohol, high caffeine intake and drugs significantly increase the risk of grinding. Smokers grind roughly twice as often.
• Medication. Certain medications, including some antidepressants, can have bruxism as a side effect. Never stop prescribed medication yourself; discuss it with your doctor.
• A misaligned bite. Sometimes your upper and lower teeth don't close together properly.

The stress-sleep cycle: why it reinforces itself

This is the core mechanism that's often overlooked. Bruxism and poor sleep sustain each other. Stress causes you to grind at night, the grinding disrupts your sleep because it unconsciously wakes you, and poor sleep makes you less resilient to stress during the day. So you're even more tense the next evening, and you grind again.

That cycle explains why a mouthguard alone often isn't enough: it protects your teeth, but doesn't break the underlying tension. If you want to stop grinding, working on your stress and your sleep is at least as important as protecting your teeth. If you generally sleep poorly or restlessly, also read our article on poor sleep, since that's where it starts for many people.

What are the effects of teeth grinding?

Occasional grinding is harmless. If it happens for a long time and regularly, it can cause damage and complaints:

• Dental damage: worn tooth surfaces, chipped enamel, cracks, loosened fillings or crowns.
• Jaw complaints: pain and stiffness in your jaw muscles and jaw joint, sometimes a clicking jaw.
• Head, ear and neck pain: the constant tension in your chewing muscles radiates outward.
• Poorer sleep: the grinding fragments your sleep, causing fatigue and concentration problems during the day.

Important: dental damage doesn't appear overnight. Usually you've already been grinding for months to years by the time it shows. Acting in time prevents permanent damage.

What helps against grinding your teeth in your sleep?

There's no switch to turn it off, but you can work on two fronts at once: protecting your teeth and tackling the cause.

Protecting your teeth

• A mouthguard (occlusal splint). A plastic device you wear at night that stops your teeth from grinding against each other. A custom-made one from your dentist fits better and protects better than a standard one from the shop. The guard doesn't remove the grinding itself, but it prevents the damage.
• See your dentist. They'll assess the wear, make a custom mouthguard, and refer you further if needed. For severe jaw complaints, treatment of the chewing muscle (for example with physiotherapy) is sometimes an option.

Tackling the cause

• Reduce stress. Since tension is the biggest factor, relaxation is key. Wind your evening down calmly, and find ways to release tension during the day.
• Relax before bed. A fixed evening routine, breathing or relaxation exercises, and putting screens away in time help your jaw and mind settle down.
• Exercise during the day. Physical activity helps release tension. From a brisk walk to yoga or running, choose what suits you, but avoid exercising right before bedtime.
• Limit alcohol, caffeine and smoking, especially in the evening. They demonstrably increase the risk of grinding.
• Create a calm sleep environment. A dark, cool and quiet bedroom helps you sleep more deeply and calmly, reducing the restless sleep in which grinding occurs.

Teeth grinding in children

In children, teeth grinding is very common. More than one in three parents notice it at some point. It usually relates to growth and the changing of teeth, and disappears on its own without treatment. If it persists, your child complains of jaw or headaches, or you notice clear wear, discuss it with the dentist.

When should you see a dentist or doctor?

Take action if:

• you consistently wake up with jaw, head or ear pain in the morning
• your dentist notices wear, cracks or damaged fillings
• your jaw stays painful, feels stiff or clicks
• the grinding occurs alongside snoring and breathing pauses (possible sleep apnoea), which warrants separate investigation
• you suspect stress or a medication is the cause

The dentist protects your teeth and assesses the damage; your doctor can look into the underlying cause, such as stress, sleep or medication.