What Causes Teeth Grinding at Night (Bruxism)?

If you have ever woken up with a sore jaw, a dull headache, or sensitive teeth, you may have wondered whether you are grinding your teeth during the night. Teeth grinding at night, clinically referred to as nocturnal bruxism, affects a significant number of adults.

This article explores the common causes of night-time teeth grinding, the symptoms to look out for, how it can affect your oral health, and when it may be appropriate to seek professional dental advice.

Common Causes of Nocturnal Bruxism

• Stress and anxiety — widely considered among the most significant contributors
• Sleep disorders — obstructive sleep apnoea, snoring, and disrupted sleep cycles
• Lifestyle factors — alcohol, caffeine, recreational substances, and smoking
• Certain medications — particularly some SSRIs (antidepressants)
• Bite irregularities — where upper and lower teeth do not align comfortably

Recognising the Symptoms of Bruxism

• Jaw pain or stiffness, particularly upon waking
• Dull headaches around the temples
• Tooth sensitivity, especially to hot or cold
• Worn, flattened, or chipped teeth
• Disrupted sleep, sometimes noticed by a partner
• Discomfort or tightness in the facial muscles

How Bruxism Affects Your Teeth and Jaw

The forces generated during teeth grinding can be significantly greater than those produced during normal chewing. Enamel wear is one of the most common consequences — as enamel wears down, the softer dentine layer becomes exposed, increasing tooth sensitivity and vulnerability to decay.

Cracks and fractures may develop, and existing restorations may become damaged. The temporomandibular joint (TMJ) can also be affected, contributing to clicking, locking, or pain in the jaw joint.

Treatment Approaches for Teeth Grinding

• Occlusal splints (night guards) — custom-made devices worn during sleep to protect the teeth
• Stress management techniques — CBT, mindfulness, regular exercise, and improved sleep hygiene
• Addressing underlying sleep disorders — managing conditions such as sleep apnoea
• Restorative dental treatment — to repair worn or damaged tooth structure where needed

The Role of Stress and Mental Health in Bruxism

The connection between emotional wellbeing and bruxism is well recognised. During sleep, the body processes psychological tensions, and elevated stress levels can translate into increased muscle activity in the jaw. For patients who suspect stress may be contributing to their grinding, it can be helpful to consider both dental and wellbeing strategies.

When Professional Dental Assessment May Be Needed

• Persistent jaw pain or stiffness that does not resolve within a few days
• Noticeable tooth wear, chipping, or flattening
• Increased tooth sensitivity that was not previously present
• Frequent morning headaches with no other apparent cause
• Disrupted sleep due to jaw clenching or grinding
• Clicking, popping, or locking of the jaw joint

Prevention and Oral Health Advice

• Establish a calming bedtime routine — reduce screen time and practise relaxation techniques
• Limit caffeine and alcohol intake, especially in the evening
• Be mindful of daytime clenching — keep lips together but teeth slightly apart
• Maintain regular dental appointments for early detection

Key Points to Remember

• Teeth grinding at night is common and often occurs without the individual being aware
• Stress, sleep disorders, and lifestyle factors are the most frequently associated causes
• Prolonged grinding can lead to enamel erosion, tooth fractures, and TMJ discomfort
• Custom occlusal splints and stress management are among the approaches that may be considered
• Regular dental check-ups are important for early detection and monitoring

Frequently Asked Questions

Is teeth grinding at night a serious problem?

Occasional grinding is relatively common and may not cause significant harm. However, when bruxism occurs frequently over an extended period, it can lead to gradual enamel wear, increased sensitivity, and jaw discomfort. A dental examination can help assess whether grinding has affected your teeth.

What is a night guard and how does it help?

A night guard (occlusal splint) is a custom-made dental device worn over the teeth during sleep. It creates a protective barrier, cushioning biting forces and reducing the risk of enamel wear and tooth damage. Your dentist can advise whether one may be suitable.

Can children grind their teeth at night?

Yes, bruxism can occur in children. It is relatively common in younger children and may be associated with tooth development. In many cases, it resolves naturally. If a child regularly complains of jaw pain or if significant grinding sounds are noticed, mention it at the next dental appointment.

This article is intended for general informational purposes only and does not constitute dental advice, diagnosis, or treatment recommendation. South Kensington Medical & Dental is regulated by the Care Quality Commission (CQC). All dentists are registered with the General Dental Council (GDC). Medical practitioners are registered with the General Medical Council (GMC).