Vitamin C can be used for oral ulcer diseases, infectious diseases, tongue diseases and other auxiliary treatment, usually oral vitamin C tablets or crushed, sprinkled on the lesions, usually do not use vitamin C ointment application, as follows. 1. Vitamin C can be used for the prevention and treatment of scurvy, as well as a variety of acute and chronic infectious diseases and purpura and other auxiliary treatment. It can be used as an adjunctive treatment drug for some oral diseases, including oral mucosal ulcer diseases, such as recurrent aphthous ulcers; oral mucosal infectious diseases, such as oral herpes simplex; tongue diseases, such as map tongue, furrowed tongue. 2. Vitamin C tablets are usually taken orally, and when treating mouth ulcers, they can be crushed and sprinkled on the ulcer surface. Vitamin C tablets taken orally can cause acid reflux, stomach upset, large doses used for a long time can cause diarrhea, headache and other symptoms, stomach ulcers should be used with caution. Drugs should be used under the guidance of a doctor, it is recommended to visit a hospital to receive professional treatment.