why do i keep biting my cheek

The main reasons for repeatedly biting the inside of the cheek include involuntary habits often triggered by anxiety, stress, or boredom, misaligned teeth or jaw (malocclusion), and dental issues such as poorly fitting dental devices or growing wisdom teeth. Cheek biting can also occur subconsciously when deep in thought or as a body-focused repetitive behavior (BFRB) often linked to mental health conditions like anxiety or obsessive-compulsive disorder. Fast or careless chewing, and distractions while eating, may also increase the likelihood of biting the cheek. Chronic cheek biting may cause injury or irritation inside the mouth and could require dental or psychological intervention if persistent.