Oral ulcer should pay attention to the following points: 1. Usually pay attention to oral hygiene, eat less smoked, salted, roasted, fried and greasy food, and do not eat hot and sour food such as pepper, raw onion, ginger, garlic, tobacco, wine and mutton. Diversified diet, eat more fruits and vegetables. 2. Live regularly to ensure adequate sleep. Keeping the stool unobstructed and preventing constipation is an indispensable part of treating recurrent oral ulcer. 3. Oral ulcer is also considered as a sign of physical weakness, so patients should not neglect to strengthen their physical fitness, improve their physical fitness, strengthen physical exercise and improve their resistance to diseases during treatment. 4. Keep a happy mood, quit smoking and drinking, and avoid overwork and tension.