Vitamin C is vitamin C. Taking vitamin C can assist in the treatment of mouth ulcers, and it is recommended that it be combined with other medications in order to achieve better results. Mouth ulcers may be related to a variety of factors, appropriate supplementation of vitamin C, can promote faster metabolism of the mucosal epithelium of the patient, for the recovery of the disease has a certain effect. However, it is difficult to achieve the therapeutic effect by using vitamin C alone. It is recommended that the patient with the use of lidocaine gel and other local pain medication, as well as watermelon cream, ice boron powder and other drugs to promote wound healing to improve the symptoms. Patients can take vitamin C preparations to supplement vitamins, but in order to avoid excessive intake of vitamin C, vitamins can be supplemented by eating fruits rich in vitamin C, such as tangerines, oranges and so on. Patients with mouth ulcers need to pay attention to their daily diet and avoid irritating foods such as garlic cloves, leeks and onions. Maintain regular eating habits, eat more food containing vitamins, pay attention to oral hygiene. Ensure a good quality of sleep, maintain optimism, avoid anxiety, tension and other negative emotions. At the same time, should be in the doctor’s guidance reasonable use of drugs, avoid self-medication.