Is Teeth Grinding Genetic? The Truth About Sleep Bruxism and Family Traits

First: Bruxism Is More Than Just Grinding at Night

Bruxism is repetitive jaw-muscle activity that can occur during sleep or while awake.

The two forms are described separately:

• Sleep bruxism involves rhythmic or non-rhythmic jaw-muscle activity during sleep.
• Awake bruxism can involve repeated or sustained tooth contact, jaw clenching, bracing or thrusting while awake.

These behaviors can overlap, but they are not necessarily produced by exactly the same mechanisms.

That distinction becomes especially important when we talk about genetics, because much of the strongest hereditary research has historically focused on sleep bruxism.

Does Teeth Grinding Run in Families?

Evidence suggests that it can.

A review of the genetics literature examined family studies, twin studies and early DNA research on bruxism. With one exception among the twin studies, the research generally supported at least some genetic contribution.

The authors concluded that dentists could reasonably tell patients that teeth grinding appears to “run in families.”

That does not mean every child of a parent who grinds will develop bruxism.

Families share much more than DNA. They can also share routines, sleep environments, behaviors, exposures and health conditions. That is why twin studies are particularly useful for separating genetic influence from shared family environment.

What Do Twin Studies Tell Us?

Identical twins share nearly all of their DNA, while fraternal twins share, on average, about half of the genetic variation that differs between people.

If a trait is consistently more similar between identical twins than fraternal twins, that pattern can provide evidence for genetic influence.

One large Finnish study examined self-reported sleep-related bruxism among young adult twins.

Researchers estimated that additive genetic effects accounted for approximately 52% of the variation in susceptibility to sleep-related bruxism within that population.

The remaining variation in their model was attributed to environmental influences that were not shared between twins.

What About Awake Bruxism?

More recent twin research suggests genetics may influence awake bruxism as well.

A 2020 nationwide study collected questionnaire data from more than 8,000 Finnish twins.

Identical twins were more similar than fraternal twins in their reports of sleep bruxism. The researchers also found patterns suggesting genetic influences on awake bruxism and some genetic influences shared between the two behaviors.

At the same time, the authors described those genetic influences as relatively modest and emphasized an important role for environmental and behavioral factors.

So genetics may contribute to both forms of bruxism without providing a complete explanation for either one.

Is There a Specific Gene for Teeth Grinding?

No single established “bruxism gene” has been identified.

Researchers have investigated genetic variants involved in neurotransmitter systems, particularly serotonin and dopamine signaling, because these systems participate in sleep, arousal, movement and other nervous-system functions.

Some individual studies have reported associations between particular gene variants and sleep bruxism.

One frequently discussed example involves the HTR2A gene, which encodes a serotonin receptor.

A 2012 Japanese case-control study found an association between one HTR2A variant and sleep bruxism.

But later studies in other populations did not consistently reproduce that finding.

What Happened When Researchers Combined the Gene Studies?

A 2023 meta-analysis examined five studies evaluating two HTR2A genetic variants and sleep bruxism.

When the results were combined, researchers found no statistically significant association between the HTR2A variants studied and susceptibility to sleep bruxism.

That is an excellent example of why genetic research needs replication.

A genetic association discovered in one relatively small population may disappear when researchers study larger or more diverse groups.

So How Can Bruxism Be Genetic Without One Bruxism Gene?

Many common human traits work this way.

Rather than one gene switching a condition on or off, many genetic differences may each contribute a very small amount to susceptibility.

Those genetic influences can then interact with other biological and environmental factors.

Bruxism is therefore better understood as a multifactorial behavior than as a simple inherited disease.

Your genes may influence your underlying susceptibility without determining exactly whether, when or how severely you will grind or clench.

If My Parent Grinds Their Teeth, Will I?

Not necessarily.

Having a family history may indicate greater susceptibility, but it does not predict your individual outcome.

Two siblings with similar genetics can have very different experiences with bruxism.

One may grind regularly, another may occasionally clench while concentrating, and another may show little meaningful jaw-muscle activity at all.

Family history is therefore useful context — not a diagnosis.

Are Children More Likely to Grind if Their Parents Do?

Family studies and pediatric research also support a genetic contribution to sleep bruxism in children.

A 2023 systematic review of pediatric sleep bruxism found associations with genetic factors alongside sleep, behavioral and psychosocial variables.

But research in children has an additional complication: many studies rely on parents hearing or reporting grinding rather than directly measuring jaw-muscle activity overnight.

That makes it difficult to assign an exact inherited risk to a particular child.

A family history may be worth mentioning to a pediatric dentist, especially if the child is also showing tooth wear or other dental concerns, but it does not mean treatment is automatically necessary.

Can Stress “Activate” a Genetic Tendency to Bruxism?

This is possible in a broad biological sense, but the evidence does not allow us to say that a particular bruxism gene switches on when someone becomes stressed.

Psychological factors including stress and distress have been associated with bruxism, particularly awake clenching, but those relationships are complex.

Genetics and stress therefore should not be framed as competing explanations.

Someone may have an inherited susceptibility and also experience environmental or behavioral factors associated with bruxism.

For the dedicated evidence on this subject, see Stress and Teeth Grinding.

What Else Influences Bruxism Besides Genetics?

Bruxism does not have one universal cause.

Depending on whether we are discussing sleep or awake bruxism, research has identified associations with factors such as:

• Psychological stress or distress
• Certain medications
• Smoking and nicotine exposure
• Alcohol use
• Caffeine
• Some sleep-related conditions
• Other neurological or medical factors in selected patients

An association does not mean every factor directly causes bruxism in every person.

Read What Causes Teeth Grinding? Bruxism Causes & Risk Factors for the broader evidence.

Can Crooked Teeth or Your Bite Be Inherited — and Cause Bruxism?

Your dental and facial anatomy certainly has genetic influences.

But that does not mean inherited tooth alignment explains inherited bruxism.

Older theories placed considerable emphasis on dental occlusion or an “uneven bite” as a cause of grinding.

Current understanding does not support a simple model in which ordinary malocclusion is the primary cause of bruxism.

Genetics may influence both craniofacial development and bruxism susceptibility without one necessarily causing the other.

Is There a Genetic Test for Bruxism?

There is currently no routine genetic test used to diagnose or predict bruxism.

Although researchers continue to investigate candidate genes and genetic variants, the evidence is not strong or consistent enough to use a DNA result to determine whether someone has or will develop clinically important bruxism.

Assessment instead focuses on actual behavior and consequences: self-reported clenching or grinding, dental examination, symptoms and, in selected sleep-bruxism cases, instrumental measurement such as electromyography or polysomnography.

Should You Be Checked for Bruxism if It Runs in Your Family?

You do not need treatment simply because a parent or sibling grinds their teeth.

But knowing the family history can make you more attentive to meaningful signs such as:

• Repeated clenching or jaw bracing while awake
• Grinding sounds reported by a sleep partner
• Progressive tooth wear
• Chipped or cracked teeth
• Repeated damage to restorations
• Morning jaw-muscle fatigue or soreness
• New or persistent tooth sensitivity

None of these signs alone proves active bruxism, and tooth wear can reflect activity that happened years earlier.

Our Warning Signs of Bruxism guide explains what dentists actually look for.

Can You Prevent Bruxism if You're Genetically Predisposed?

There is no proven method for switching off an inherited susceptibility to bruxism.

That does not mean nothing can be done.

For awake bruxism, becoming aware of repeated clenching or jaw bracing can help some people interrupt the behavior.

When medication, substance use or another health condition appears temporally related to symptoms, those factors can be discussed with the appropriate clinician.

And when grinding or clenching is putting the teeth at risk, the teeth themselves can be protected even if the underlying tendency remains.

What Can a Night Guard Do if Bruxism Runs in Your Family?

A night guard does not change your genes and does not cure an inherited tendency to grind.

Its primary purpose is mechanical protection.

A properly fitted guard creates a replaceable surface between opposing teeth, helping protect tooth structure and dental restorations from direct grinding contact.

Whether you need one should be based on your own dental findings and bruxism activity — not merely on family history.

Learn more about how mouth guards protect teeth from grinding and clenching.

Frequently Asked Questions

Is teeth grinding hereditary?

Research from family and twin studies suggests that bruxism has a hereditary component. Genetics appears to influence susceptibility, particularly to sleep bruxism, but it does not determine who will grind their teeth with certainty.

How much of bruxism is genetic?

One large twin study estimated that genetic effects accounted for about 52% of population-level variation in susceptibility to self-reported sleep-related bruxism. That number is a heritability estimate for a specific study population and does not mean that 52% of an individual's bruxism is genetic.

Is there a bruxism gene?

No single established bruxism gene has been identified. Multiple candidate genes have been studied, but individual genetic findings have often been inconsistent across populations.

Can I inherit teeth grinding from my mother or father?

You may inherit genetic factors that increase susceptibility, but bruxism does not appear to follow a simple inheritance pattern in which one affected parent means a child will automatically develop it.

If both my parents grind their teeth, will I?

Not necessarily. Family history may increase susceptibility, but environmental, behavioral, medical and other biological factors also contribute.

Can children inherit bruxism?

Pediatric research supports a genetic component to sleep bruxism, but the exact inherited risk for an individual child cannot currently be predicted.

Can a DNA test tell me if I will grind my teeth?

No routine clinical genetic test can currently predict or diagnose bruxism.

If my bruxism is genetic, can it still be treated?

Yes. Genetic susceptibility does not prevent clinicians from addressing modifiable associated factors, awake clenching behavior, pain or dental damage. A night guard can also protect vulnerable teeth when appropriate, although it does not change the underlying genetic susceptibility.

The Bottom Line

Teeth grinding really does appear to run in families — but “genetic” does not mean inevitable.

Family studies and several generations of twin research support a hereditary contribution to bruxism. One large young-adult twin study estimated that genetic influences explained roughly half of the population-level variation in susceptibility to self-reported sleep-related bruxism.

More recent twin research also suggests some genetic influence on awake bruxism.

What scientists have not found is one reliable gene that determines who will grind. Even a widely studied serotonin-receptor variant failed to show a significant overall association when multiple studies were combined in a meta-analysis.

The best model is therefore one of susceptibility: genes may load the dice, while sleep, behavior, medications, substances, psychological factors and other aspects of health help shape what actually happens.