The ways to cure mouth ulcers include reducing irritation, local medication, local closure, systemic medication, and other treatments. 1. Reduce the stimulation: reduce the local stimulation factors, such as too cold and too hot food. 2. Local medication: anti-inflammatory antiseptic, astringent muscle growth, swelling and analgesic drugs, such as 0.1% tretinoin ointment, lidocaine gel. The medication should be used under the guidance of a doctor. 3. Local closure: for severe, long-standing, painful ulcers, submucosal local closure treatment is feasible. 4. Systemic medication: in severe cases, glucocorticoid drugs can be applied systemically, such as oral tretinoin. The use of medication should be carried out under the guidance of a doctor. 5. Other treatments: physical therapy can be used. Mouth ulcers are recommended to consult the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment and therapy.