Recurrent oral ulcers, also known as recurrent aphthous ulcers, refer to ulcerative diseases of the oral mucosa characterized by periodic recurrence. The etiology is unknown, but it is thought to be related to the following factors: immune dysfunction, vitamin and trace element deficiency, gastrointestinal and endocrine system diseases, mental stress, genetics, etc. Treatment of recurrent mouth ulcers is aimed at reducing recurrence, prolonging the interval, reducing pain, and promoting healing. Recurrent mouth ulcer patients live common sense as follows: 1, pay attention to dietary balance, not partial food, not picky, more vegetables and fruits, walnuts, almonds and other foods rich in vitamins and trace elements. 2, life should be regular, to ensure 7-8 hours of sleep per day, improve the quality of sleep, do not stay up late. 3, for gastrointestinal tract dysfunction with constipation, constipation, timely treatment. 4, oral mucosa to avoid trauma stimulation, eat less hard, too hot food such as fried, puffed food. 5, choose soft-haired toothbrush and suitable, mild toothpaste, often change the brand of toothpaste. 6.Actively treat periodontal diseases and maintain oral hygiene. In addition, recurrent mouth ulcers will not become cancerous. If the ulcer lesion is fixed in one part and does not heal for a long time, and the texture becomes hard, you should consult a doctor in time.