If you have a mouth ulcer, it is recommended that you eat more vitamin-rich foods in your daily life, as follows: 1. You can eat more cabbage, cabbage is rich in vitamins and has a very good therapeutic effect on ulcers, which can accelerate the healing of ulcers and also prevent ulcers from becoming malignant and leading to more serious diseases. 2. You can eat cabbage, which is rich in vitamin B2 and trace elements such as zinc. These elements can promote the healing of ulcers, but also to nourish the stomach, cool the fire. 3, can eat lotus root, lotus root contains a lot of vitamin C and vitamin K, can promote the recovery of ulcer wounds, containing vitamin B and other trace elements, can promote the repair of the oral mucosa epithelium. 4, can eat more tomatoes, tomatoes contain a lot of vitamin B, vitamin A, vitamin K, riboflavin, and so on. These can prevent gum bleeding and are very good for the treatment of mouth ulcers.