Almost everyone accidentally bites the inside of a cheek occasionally. Repeated cheek biting is different. It may happen because the cheek keeps getting caught between the teeth, because of a dental or bite issue, during sleep, or as a repetitive habit that becomes difficult to stop.
Editor’s Note: This article was updated on September 3, 2026 to clarify the different causes of repetitive cheek biting, distinguish habitual behavior from accidental and nighttime biting, and provide more careful guidance on when dental, behavioral or protective treatment may be appropriate.
The best way to stop cheek biting depends on when and why it is happening.
Someone who unconsciously chews the inside of a cheek while concentrating needs a different solution from someone who wakes up with a bitten cheek after involuntary jaw movement during sleep.
Why Do I Keep Biting the Inside of My Cheek?
Cheek biting does not have one universal cause.
It is useful to first separate accidental biting from habitual cheek chewing and from biting that occurs during sleep.
| Pattern | What it may look like | Best starting point |
|---|---|---|
| Occasional accidental bite | You catch your cheek while eating or talking and it happens infrequently | Allow the area to heal and watch for recurrence |
| Repeated accidental biting | The same cheek area keeps getting caught between the teeth | Have a dentist check the bite, teeth and dental work |
| Habitual cheek chewing | You bite or chew the cheek automatically, during concentration, stress or boredom | Identify triggers and consider behavioral support if difficult to stop |
| Nighttime cheek biting | You wake with soreness, cuts or recurring cheek injuries | Consider dental evaluation and soft-tissue protection |
1. Accidental Cheek Biting
Biting your cheek once in a while while chewing is common.
The more important question is whether the same area is being injured repeatedly.
If it is, something may be causing the cheek to sit closer to the biting surfaces than it did previously.
Possible contributors include changes in the way the teeth meet, a sharp tooth or restoration, missing teeth, orthodontic changes or other differences in dental anatomy.
A swollen cheek can also become easier to bite again. This sometimes creates a cycle in which an initial injury leads to swelling, the swollen tissue moves closer to the teeth, and the area gets caught again before it has healed.
2. Habitual or Repetitive Cheek Chewing
Some people do not simply catch the cheek accidentally. They repeatedly bite, nibble or chew the inside of it.
This pattern is sometimes called morsicatio buccarum.
Repeated chewing can leave the inner cheek feeling rough, thickened or irregular. That texture itself may then make the area more tempting to bite again.
The behavior may happen almost automatically while reading, working, driving, concentrating or watching television. Other people notice that it increases when they are stressed, anxious or bored.
Is cheek biting a body-focused repetitive behavior?
Chronic cheek chewing is often discussed alongside body-focused repetitive behaviors, or BFRBs.
BFRBs are repetitive self-directed behaviors that may become difficult to control and can result in tissue damage or emotional distress.
That does not mean everyone who occasionally bites a cheek has a behavioral or psychiatric condition.
The distinction becomes more relevant when the behavior is repetitive, difficult to stop, physically damaging or significantly distressing.
3. Stress and Anxiety
Stress does not explain every case of cheek biting, but it can influence repetitive oral habits in some people.
You may notice the behavior most when concentrating, worrying, working under pressure or feeling socially uncomfortable.
Instead of assuming stress is the cause, look for a pattern.
Ask yourself:
- When do I notice myself biting?
- Am I aware of it before the cheek starts hurting?
- Does it happen during concentration or boredom?
- Does stress make it more frequent?
- Do I keep returning to one rough area of tissue?
Simply becoming aware of when the behavior begins can be useful because many repetitive oral habits occur automatically.
4. Dental Anatomy and Bite Changes
If you are not deliberately chewing your cheek but the same area repeatedly gets caught between the teeth, have a dentist look at the physical relationship between the cheek and your bite.
A dentist can check for:
- a sharp or fractured tooth;
- a rough filling, crown or restoration;
- changes in tooth position;
- areas where the cheek consistently falls between the teeth;
- recent dental or orthodontic changes;
- or another local source of irritation.
The solution may be very different when the cheek is being mechanically caught by a particular tooth than when biting is a behavioral habit.
5. Cheek Biting During Sleep
Some people do not notice cheek biting while they are awake at all. Instead, they wake with a sore or injured inner cheek.
During sleep, involuntary jaw closure, clenching, grinding or other jaw movement can bring soft tissue between the teeth.
This overlaps with nighttime tongue biting, which we discuss in: Why Do I Bite My Tongue in My Sleep?
Repeated nighttime injuries deserve more attention than an isolated accidental bite, particularly if they occur alongside unusual movements, significant sleep disruption or other concerning symptoms.
How Do You Stop Cheek Biting?
The most effective strategy depends on which pattern describes you.
If you bite your cheek accidentally while eating
Give the injured tissue an opportunity to heal and pay attention to whether the same location continues to be caught.
Repeated injury in one specific location is a good reason to have the teeth and bite examined.
If you chew your cheek habitually while awake
Begin by identifying the situations in which the behavior occurs.
Awareness is particularly important when the habit happens automatically. Notice what you were doing immediately before you started biting and whether there was a sensory trigger, such as a rough area inside the cheek.
When the behavior is difficult to control, causes repeated tissue injury or creates significant distress, a therapist familiar with body-focused repetitive behaviors can help identify triggers and use structured behavioral strategies.
If a dental problem is causing the cheek to get caught
See a dentist rather than trying to reshape a tooth or dental restoration yourself.
The goal is to determine why that particular area is repeatedly contacting the cheek.
If you bite your cheek during sleep
Protection from the teeth may help reduce repeated injury when the immediate problem is soft tissue becoming caught between the dental arches.
A protective appliance should be understood as a mechanical barrier. It does not necessarily stop the involuntary jaw movement that caused the biting.
Can a Mouth Guard Help Stop Cheek Biting?
A mouth guard can be useful in some situations—but the purpose matters.
A traditional one-arch night guard is designed primarily to protect teeth and dental work from the effects of grinding or clenching.
Cheek and tongue biting are different because soft tissue can become caught between either the upper or lower teeth.
Sentinel's Tongue & Cheek Biting Guards are therefore designed as a matched upper-and-lower set. Covering both arches creates smooth protective surfaces over the teeth that would otherwise contact the inner cheeks and tongue.
For a full comparison of guard designs, see: Best Mouth Guard for Cheek and Tongue Biting .
What Sentinel's Tongue & Cheek Guards Are Designed to Do
In our customer conversations, people often describe the same very specific problem: the tongue or cheek becomes “caught” between their teeth during sleep.
Sentinel's Tongue & Cheek Biting Relief Guards were designed for that soft-tissue problem rather than as another version of a traditional grinding guard.
The set includes a custom appliance for the upper teeth and another for the lower teeth. Together, they place smooth protective surfaces over both dental arches.
People whose main concern is heavy tooth grinding, heavy clenching or protection of worn teeth should generally consider a traditional custom night guard instead.
Learn more about Sentinel Tongue & Cheek Biting Relief Mouth Guards .
How Do You Help an Already-Bitten Cheek Heal?
Minor cheek injuries often improve once repeated trauma stops.
The important part is preventing the same swollen or irritated area from being bitten over and over again.
Deep wounds, persistent bleeding, significant swelling, signs of infection or an area that does not heal should be evaluated professionally.
We cover wound care separately in: How to Care for Tongue and Cheek Biting Injuries .
Can Chronic Cheek Biting Cause Oral Cancer?
Current evidence does not support telling people that habitual cheek biting itself causes oral cancer.
Repeated friction can injure and thicken oral tissue, and chronic cheek chewing can create persistent-looking changes inside the mouth. But mechanical irritation has not been established as a cause of oral cancer.
That does not mean a persistent oral lesion should simply be assumed to be cheek biting.
If an area looks unusual, continues to enlarge, bleeds without an obvious reason, becomes increasingly painful or simply does not resolve, have a dentist or other qualified healthcare professional examine it.
When Should You Get Professional Help for Cheek Biting?
Consider professional evaluation when:
- you repeatedly bite the same area without understanding why;
- the tissue is frequently bleeding, ulcerated or painful;
- a tooth or restoration seems to be cutting the cheek;
- the behavior feels compulsive or very difficult to control;
- cheek chewing is causing significant distress or interfering with daily life;
- injuries repeatedly occur during sleep;
- or an oral lesion is persistent or otherwise concerning.
Depending on the pattern, the appropriate professional may be a dentist, physician or behavioral-health professional.
The Bottom Line
The first step to stopping cheek biting is figuring out what kind of cheek biting you are dealing with.
An occasional accidental bite usually needs little more than time to heal. Repeated biting in the same location may point to dental contact or a bite issue. Habitual cheek chewing may require awareness and behavioral strategies. Nighttime cheek biting may benefit from protection between the teeth and soft tissue.
Sentinel's upper-and-lower Tongue & Cheek Biting Guards are designed for the mechanical problem of soft tissue becoming caught between the teeth. They are not intended to diagnose the cause of the behavior or replace appropriate dental, medical or behavioral care.