Why Do People Grind Their Teeth? Causes and Advice

Many people grind or clench their teeth at some point in their lives, often without realising it. The clinical term for this is bruxism — a condition involving repeated jaw-muscle activity that can include grinding, clenching or bracing the teeth. It may occur during sleep, whilst awake, or in some individuals, during both.

Although bruxism is relatively common, the reasons behind it vary considerably from person to person. Understanding the possible contributing factors can help individuals make informed decisions about their oral health and seek appropriate support when needed.

Quick Answer: Why Do People Grind Their Teeth? Teeth grinding — clinically known as bruxism — involves repeated jaw-muscle activity that may occur during sleep (sleep bruxism) or whilst awake (awake bruxism). Possible contributing factors include stress, sleep disturbances, certain medicines and other associated conditions, though the precise cause can vary significantly between individuals. There is no single approach that works for everyone; management depends on the nature, severity and likely contributing factors of a person's symptoms.

Bruxism is not a single, uniform experience. Clinicians distinguish between two main forms:

Sleep bruxism occurs during sleep and is considered a sleep-related movement behaviour. Because it happens unconsciously, many people are unaware they are doing it until a partner mentions the noise, or until a dentist identifies signs of tooth wear during a routine examination.

Awake bruxism involves unconscious jaw clenching or muscle tension whilst a person is conscious — often during periods of concentration, stress or anxiety. Someone may notice they are clenching their jaw whilst working, driving or responding to a stressful situation, though in many cases the habit goes unrecognised for some time.

Some individuals experience elements of both. The distinction matters because the contributing factors and appropriate management strategies may differ between the two forms.

Research into bruxism is ongoing, and whilst several factors have been associated with the condition, the picture is rarely straightforward. It is important to understand that an association does not always indicate a direct cause in every individual.

Stress, anxiety and emotional tension are among the most frequently reported associations with both sleep and awake bruxism. Periods of sustained psychological pressure — whether related to work, relationships or significant life events — may contribute to increased jaw-muscle activity, particularly at night.

Sleep quality may also play a role. Disrupted sleep patterns, sleep-disordered breathing such as snoring or obstructive sleep apnoea, and other sleep-related disturbances have been linked to sleep bruxism in some research. However, the relationship between sleep and bruxism is complex and not yet fully understood.

Certain medicines — particularly some antidepressants, notably selective serotonin reuptake inhibitors (SSRIs) — have been associated with bruxism as a possible side effect in some individuals. If you are concerned that a prescribed medicine may be contributing to jaw symptoms, this is something to discuss with your prescribing doctor or pharmacist. Do not adjust or stop any prescribed medication without appropriate professional advice.

Caffeine, alcohol and recreational substances have also been identified as possible contributing factors in some studies, particularly in relation to sleep bruxism.

Bruxism has been observed more frequently in individuals with certain neurological conditions, and there is some evidence of a genetic component, meaning it can run in families. These associations are noted in clinical literature, though they do not mean that everyone who grinds their teeth has an underlying condition.

Because much teeth grinding — particularly the sleep-related kind — occurs without a person's awareness, recognising the possible signs is an important first step.

Common signs and symptoms that may suggest bruxism include:

• Waking with a dull headache, particularly across the temples

• Jaw muscle soreness, stiffness or a sensation of tightness in the morning

• Facial discomfort or pain around the jaw joints

• Tooth sensitivity, particularly to temperature changes

• Flattened, chipped or worn tooth surfaces, identified during a dental examination

• Disrupted sleep, or a sleep partner reporting grinding sounds

• A feeling of tiredness in the jaw muscles during the day

It is important to note that these symptoms can have other causes. A dental examination is often the most reliable way to assess whether signs of tooth wear or jaw-related changes are present, and to explore what may be contributing to them.

Headaches — particularly those felt around the temples, jaw or neck upon waking — are commonly reported by people who grind or clench their teeth during sleep. This is thought to relate to sustained muscle tension in the jaw and surrounding muscles during periods of bruxism activity.

Similarly, some people notice broader facial discomfort or tension, sometimes described as a heaviness or ache across the lower face. This is sometimes referred to in clinical contexts as bruxism face, reflecting the muscular involvement of the jaw and cheeks.

However, headaches and facial discomfort have a wide range of potential causes. A bruxism-related headache should not be assumed without proper assessment, and persistent or severe headaches always warrant professional evaluation.

Toothache or tooth sensitivity associated with bruxism is possible, particularly where repeated grinding has contributed to enamel wear, micro-fractures or increased pressure on existing dental restorations. However, a toothache can have many causes unrelated to grinding, and a clinical assessment is important to determine the most likely explanation.

Whilst there is no universally effective solution for bruxism, and it is important to be cautious about claims that any single approach will "cure" the condition, several strategies may help reduce its frequency or impact for some individuals.

Because stress and anxiety are frequently associated with bruxism, approaches that support psychological wellbeing and reduce tension may be beneficial. These can include regular physical activity, mindfulness-based techniques, adequate rest and, where appropriate, speaking with a mental health professional.

Learning to notice and consciously release jaw tension during the day can also be helpful for awake bruxism. Simple practices — such as gently resting the tongue on the roof of the mouth, keeping teeth slightly apart when not eating or speaking, and avoiding unnecessary jaw clenching — may help reduce habitual muscle tension over time.

Some people find that reducing caffeine and alcohol intake — particularly in the hours before sleep — may contribute to improved sleep quality and potentially reduced bruxism activity. Establishing a relaxing pre-sleep routine and maintaining a consistent sleep schedule may similarly support better sleep overall, though individual responses vary.

Avoiding chewing hard objects such as pens, ice or fingernails, and being mindful of dietary choices that place excessive strain on the jaw, may also be worthwhile.

It is worth being realistic about self-care. Practical measures may help manage mild or occasional symptoms, but they are unlikely to address the underlying factors in all cases. Where symptoms are persistent, causing tooth damage, disrupting sleep or significantly affecting quality of life, professional assessment becomes more appropriate.

A dentist experienced in managing bruxism can evaluate the degree of any tooth wear, assess the jaw and surrounding structures, and discuss which management options might be appropriate based on an individual's specific circumstances.

One of the most commonly recommended approaches for teeth grinding is a custom-fitted occlusal splint or night guard. These are removable dental appliances, typically worn during sleep, that create a protective barrier between the upper and lower teeth. They do not stop the grinding behaviour itself but can reduce the wear on tooth surfaces and may help alleviate jaw discomfort for some individuals.

Over-the-counter mouthguards are available but are generally considered less effective than custom-fitted appliances, which are designed to fit precisely and distribute forces more evenly.

Where bruxism appears to be linked to sleep-disordered breathing, significant anxiety or other health considerations, a dentist may recommend referral to an appropriate specialist. In some cases, a multidisciplinary approach — involving dental, medical and psychological support — may offer the most comprehensive pathway.

It is not uncommon for young children, including those around the age of four, to grind their teeth during sleep. In many cases, childhood bruxism resolves on its own as the child grows and their dental development progresses. It is generally less likely to cause lasting damage to primary (milk) teeth than adult bruxism is to permanent teeth, though this can vary.

If a parent or carer is concerned about a child grinding their teeth, it is always sensible to mention this at a routine dental check-up. A child's dentist can assess whether any monitoring is needed and provide age-appropriate guidance. Adult management strategies should not be applied to children without professional advice.

Teeth chattering — for example, from cold temperatures or anxiety — and involuntary jaw movements are not the same as bruxism, even though they may feel similar. These can have other explanations, including physiological responses to temperature, neurological factors or other conditions. If you are uncertain about unusual jaw movements or sounds, a professional assessment is the most appropriate next step.

It is worth speaking to a dentist if:

• You regularly wake with jaw soreness, headaches or tooth sensitivity

• A partner has noticed grinding sounds during your sleep

• You notice visible changes to your teeth, such as flattening or chipping

• Jaw discomfort or facial tension is affecting your daily comfort or sleep quality

• Symptoms are worsening or not improving with self-care measures

Maintaining regular dental check-ups gives your dentist the opportunity to identify early signs of tooth wear or jaw-related changes before they become more significant, even if you are not currently experiencing symptoms.

Teeth grinding is more common than many people realise, and for most individuals, understanding the possible contributing factors — and taking sensible steps to address them — can make a meaningful difference. Whether you are experiencing occasional jaw tension or have noticed signs of wear over time, early awareness and appropriate professional guidance remain the most effective foundations for protecting your long-term oral health.

If you are concerned about symptoms that may be related to bruxism, speaking to a dental professional is a sensible first step. A thorough assessment can help clarify what is happening and which options may be most appropriate for your individual circumstances.

The information provided in this article is intended for general educational and informational purposes only. It relates specifically to the topic of teeth grinding (bruxism), its possible causes, associated symptoms and general management considerations. This content does not constitute professional dental or medical advice, nor should it be used as a substitute for an individual assessment by a qualified dental professional.

Symptoms associated with bruxism — including jaw discomfort, headaches, tooth sensitivity and tooth wear — can vary considerably between individuals and may have causes unrelated to teeth grinding. A clinical assessment is required to reach an appropriate diagnosis and to determine which management options, if any, are suitable for your specific circumstances.

This article does not provide a diagnosis, recommend a specific treatment plan or guarantee any clinical outcome. If you are experiencing persistent or concerning symptoms, please seek advice from a qualified dental or healthcare professional. Do not start, stop or adjust any prescribed medication based on the information in this article.

Written Date: 23 October 2026

Next Review Date: 23 October 2027