There is no fastest way to eliminate ulcers on the mouth, at present, you can choose general treatment, local medication, systemic medication to alleviate the symptoms. 1. General treatment: pay attention to oral and mouth hygiene, and insist on brushing teeth and rinsing mouth to reduce secondary infection. Diet should be as light as possible, avoiding spicy and stimulating foods. 2. Topical medication: In order to promote mucosal healing, you can follow the doctor’s instructions for external use of watermelon cream spray, iodine tablets and so on. If the local ulceration has pain, then apply lidocaine gel, compound benzocaine gel to relieve pain. 3. Systemic medication: you can take vitamin C and vitamin B orally, which can enhance immunity and reduce the rate of ulcer formation. Ulcers on the mouth, you can first use the above ways to treat, if repeated ulcers or long time after the long ulcers do not heal, it is necessary to consult a doctor in time.