Eating always biting the flesh on the side of the mouth may be caused by bad chewing habits, poor bite relationship, poor restoration of oral teeth and other reasons. 1. Bad chewing habits: If patients chew unilaterally for a long time, it will lead to poor occlusal relationship on one side, which will lead to biting the meat on the side of the mouth all the time. 2. Poor occlusal relationship: Generally, long-term anticlasticity will lead to changes in the natural shape of the buccal mucosa, which is also easy to bite the cheek. Sharper teeth are also easy to bite the cheek, need to visit the stomatology department to check, can be adjusted to improve. 3. Poor dental restorations: If the patient wears poor restorations, resulting in bite disorders, it is also easy to bite the cheek. For long-term edentulous patients, the buccal mucosa has protruded to the oral side, so patients are prone to bite the buccal mucosa after repairing the complete denture. There may be other reasons for always biting the flesh on the side of the mouth when eating, and patients are advised to actively seek medical attention to avoid delaying their condition.