1. Dyspepsia: When oral ulcer occurs, eat less high-fat and high-sugar foods and drink more water to make gastrointestinal peristalsis smooth and defecation smooth, which is beneficial to the relief of oral ulcer;

2, lack of vitamins: eat more vitamins, fresh vegetables and fruits, but also supplement vitamin preparations, such as vitamin B2, vitamin B complex, vitamin C and so on. It is more conducive to the relief of oral ulcers.