Eating always biting the inner wall of the lower lip may be related to dietary habits, bite relationship disorders, oral ulcers and other factors. 1. Dietary habits: some patients may increase the intensity of chewing when consuming certain hard foods, and when the amplitude is too large, they may bite the inner wall of the lower lip, which is a normal phenomenon. 2. Bite relationship disorders: if eating often bite the inner wall of the lower lip, consider and teeth alignment is not related, such as the presence of missing teeth or wisdom teeth, etc., will be due to the bite relationship disorders of the teeth, so it is easy to bite the phenomenon of eating always to the inner wall of the lower lip. 3. Mouth ulcers: If the patient has mouth ulcers, the edges of the ulcers may be red, swollen and protruding, so it is easy to bite the inner wall of the lower lip when eating. If it is an occasional bite to the inner wall of the lower lip, generally do not need special treatment. If it is related to pathological factors, it needs to be treated accordingly by a professional dentist.