The treatment methods of recurrent oral ulcers are as follows: 1. local treatment: the principle of anti-inflammatory and pain relief, prevention of secondary infection and promotion of healing, anti-inflammatory drugs, pain relief drugs and corrosive drugs can be used on the affected area; for ulcers that do not heal for a long time or have obvious pain, such as heavy oral ulcers, submucosal closed injection can be done; 2. systemic treatment: the principle of allopathic treatment, reducing recurrence and promoting healing can be considered. The systemic treatment: to treat the cause, reduce recurrence and promote healing, consider taking adrenocorticotropic hormone and other immunosuppressants, immune enhancers or traditional Chinese medicine, etc. 3. For mouth ulcers, you should explore the recurrence pattern, look for recurrence triggers, avoid and reduce the stimulation of triggering factors, pay attention to the regulation of life and work rhythm, adjust emotions and balanced diet. Usually, you should eat a light diet, drink more water, eat more vegetables and fruits, eat less spicy and stimulating food, and it is not recommended to drink coffee because caffeine has a stimulating effect and may aggravate the ulcer.