Oral ulcer is a disease of oral mucosa caused by many factors, including high mental pressure, poor sleep, heredity, lack of vitamins and trace elements, etc. The diet should be light to improve the symptoms. You can eat more vegetables, melons and fruits, and supplement vitamin C and vitamin B. The fruits with more vitamin C and vitamin B include kiwi fruit, apple, orange, pear, grapefruit, banana, grape, etc.
