The white film after wisdom teeth extraction is considered to be a normal healing process, or it may be caused by the invasion of food debris. 1. Normal healing process, white film after wisdom teeth extraction may be the healing process of the traumatic tissue after wisdom teeth extraction of the mechanized tissue, may produce white or gray material, this situation is generally more normal. 2. Food debris invasion, some patients with white film after wisdom teeth extraction may be related to the invasion of food debris, chewing may be a small amount of food debris falling into the cavity, so this situation may occur. If there is no other abnormal reaction, generally do not need treatment, but if there is obvious pain, bleeding and other symptoms appear, it is best to actively seek medical attention.