Mouth long ulcers quickly eliminate the method of priority choice of local drugs, such as anti-inflammatory drugs, analgesic drugs, promote healing drugs, glucocorticoid drugs, etc., as follows. 1. Anti-inflammatory drugs: containing chlortetracycline, chlorhexidine, glucocorticoid film, 0.1% tretinoin ointment, chlorhexidine gargle, cidadex iodine tablets, watermelon cream powder and so on. 2. Analgesic drugs: Lidocaine gel, spray, benzocaine gel and so on. 3. Promote healing drugs: recombinant human epidermal growth factor gel, rehabilitation of new liquid and so on. 4. Glucocorticoid drugs: trimethoprim oral paste, dexamethasone ointment and so on. All of the above medications should be used under the guidance of a doctor. If the ulcers are serious and the symptoms continue to remain unabated, it is recommended to go to the hospital.