Why Do I Keep Biting My Lips? Causes and When to See a Dentist

Perhaps you’ve recently noticed that you’ve developed a habit of biting your lips. While an occasional accidental bite is common, chronic lip biting can lead to persistent sores, tissue damage, and underlying health concerns. For many, it is a nervous habit, but it is essential to understand when this behavior signals dental, psychological, or developmental conditions that require professional attention.

Understanding the Causes of Lip Biting

Lip biting is often an unconscious behavior, but it typically stems from specific underlying issues:

• Temporomandibular Disorders (TMJ): The TMJ connects your jaw to your skull. When this complex joint is affected by injury or stress, it can lead to pain or difficulty moving the jaw. Research indicates that up to 37 percent of individuals with TMJ disorders exhibit habits like biting their lips or other objects.
• Dental Misalignment (Malocclusion): If your upper and lower jaws are not the same size, or if you have extra, missing, or abnormally shaped teeth, your bite may be misaligned. While many cases are minor, severe malocclusion can cause discomfort and, in children, may even impede the correction of dental alignment. Red flag: If you notice frequent cheek or lip biting while chewing, it may indicate that your teeth are not meeting correctly, requiring an orthodontic evaluation.
• Psychological Factors: The Anxiety and Depression Association of America (ADAA) notes that body-focused repetitive behaviors (BFRBs) include habits like chronic lip biting, which are often linked to stress or anxiety.
• Developmental Factors: Studies in the International Journal of Clinical Pediatric Dentistry suggest that individuals with autism may be more prone to self-harm behaviors, including repetitive lip biting.

When to See a Professional

If you or your child have a habit of biting your lips often, the best first course of action is to consult a dental professional. We believe that knowledge is power, and taking this initial step of having an honest conversation with your dentist can put your mind at ease. They can help identify the root cause and provide a path forward. If a TMJ disorder is suspected, your dentist may recommend home remedies such as massaging jaw muscles, limiting your diet to soft foods, or using a nightguard to help muscles relax. If the cause is psychological, they may refer you to a specialist, such as a mental health provider experienced in BFRBs. Clinical distinction: A dentist can differentiate between a habit caused by structural dental interference versus a behavioral or psychological compulsion.

Frequently Asked Questions

Is lip biting a sign of a serious condition?

Occasional biting is usually harmless, but chronic biting can be a symptom of TMJ disorders, malocclusion, or psychological conditions that warrant a professional evaluation.

Can lip biting cause permanent damage?

Yes, chronic biting can cause tissue damage and, in children, can interfere with the successful correction of dental alignment issues. Note: Persistent trauma to the lip tissue can lead to chronic inflammation or the development of fibromas (benign growths) that may require surgical removal.

How do I stop biting my lips when I am anxious?

If the behavior is a BFRB, it is best to consult a mental health professional. In the meantime, identifying your triggers and practicing stress-management techniques can be helpful.

Should I see a dentist if I have a sore from biting?

Yes. If you have concerns about the frequency of the habit or if sores are persistent, schedule an appointment with your dentist to rule out underlying issues and receive appropriate care.