The mouth ulcer is not to pick off. 1. general oral ulcers around the gray-white material is a pseudomembrane, this pseudomembrane has a certain protective effect on the ulcer, at this time, such as unauthorized picking off the white is not desirable, may aggravate the local mucous membrane damage, prolonging the healing time of the ulcer. 2. If in the process of picking off the process of improper treatment, may make the ulcer at the bacterial infection; will also cause severe pain and wound re-injury. Therefore, long mouth ulcers must avoid casual treatment. The disease, should go to the hospital in time to seek medical advice to receive formal treatment. Under the guidance of the doctor, with the local application of ice boron powder and other drugs. Usually also pay attention to oral hygiene and cleanliness, light diet during the recovery period, avoid eating spicy and stimulating food, the use of drugs need to follow the doctor’s instructions.