There will be bite lines on the inner wall of the face after tooth extraction, usually not caused by the extraction of teeth, if the opposite side also have, then this is a normal physiological phenomenon, is the upper and lower teeth bite formation. Most people may appear bite line, is a normal situation, as long as there are no obvious symptoms, generally do not have to treat, in the usual process of biting the upper and lower teeth will cause some stimulation of the inner wall of the face, resulting in keratinization of the mucous membrane to form a white line, there is no pain and discomfort symptoms do not have to be overly nervous. If there is obvious erosion, pain and other symptoms, you need to consult a doctor in time to determine whether there is lichen planus and other diseases. Usually need to pay attention to personal oral hygiene, eat less spicy and stimulating food, especially can not eat betel nut for a long time, will cause mucosal burns and other undesirable stimuli, over time may cause cancer.