Mouth ulcers for two consecutive months are mainly for general treatment as well as medication. 1. General treatment: when brushing teeth, you should use a soft toothbrush to avoid traumatizing the oral mucosa, eat a light diet, don’t eat too salty or too spicy food to avoid irritating the ulcerated area, prohibit drinking and smoking, and take a reasonable rest every day to ensure sufficient sleep. 2. Medication: antibacterial mouthwash can be used to give improvement, such as chlorhexidine mouthwash, when the symptoms are more serious, corticosteroids can also be applied, such as tretinoin oral paste, dexamethasone cream and so on. During the treatment period, we should listen to the doctor’s guidance, safe and reasonable use of medication treatment, do not indiscriminate use of drugs, to avoid causing serious adverse reactions.