Vitamin C can cure mouth ulcers and has a significant role in promoting the elimination of ulcer inflammation and wound healing. Patients with mouth ulcers can take oral vitamin C tablets or use dietary therapy to supplement vitamin C. You can eat more fresh fruits, such as lemon, passion fruit, cherry, orange, watermelon, grape, grapefruit, apple, etc. Also drink plenty of water, maintain a light, easy-to-digest diet, and do not eat particularly hot, spicy, or hard foods to prevent irritation of the ulcer surface. Patients with mouth ulcers should maintain a regular work and rest schedule, adequate sleep and proper exercise to enhance the immunity of the body. You can apply watermelon cream spray, compound furacilin paste or gargle with rehabilitative new liquid locally on the ulcer to promote the elimination of inflammation and the healing of the ulcer. If the ulcer is caused by residual roots, sharp tooth tips, residual crowns or bad restorations in the mouth, prompt medical attention should be sought to solve the dental problem.