Canker sores in the mouth can be treated with general measures, medications, and other treatments. Usually, mild cases can be cured after general measures. 1. General measures: patients need to add water in moderation to keep the mouth moist. Diet needs to eat more fresh vegetables and fruits, try to avoid eating spicy, stimulating food, and need to ensure that there is enough rest time, active exercise, enhance the body’s immunity, but need to avoid overwork. Usually, patients with mild disease will recover after a period of time. 2. Drug treatment: patients with unbearable pain need to follow the doctor’s instructions for local use of compound benzocaine gel, lidocaine gel and other painkillers. Patients also need to be under the guidance of the doctor to use local oral ulcers, ice boron powder and other drugs to promote the healing of ulcers, or follow the doctor’s instructions to use chlorhexidine gargle. If the symptoms are serious, the use of levamisole, thalidomide and other immune preparations as prescribed by the doctor. 3. Other treatments: Secondly, patients can also help regenerate the oral mucosa through physical measures such as laser irradiation to promote the healing of ulcers. Patients with mouth ulcers need to strengthen the daily life management, if necessary, need to go to the hospital, follow the doctor’s instructions for medication.