Recurrent mouth ulcers can not be cured, avoid recurrence by watermelon cream, vitamin B2, multi-dimensional elements tablets, mouth ulcers are a relatively common clinical condition in daily life, mainly related to gastrointestinal tract dysfunction, lower body immunity, oral unhygienic, mental factors, lack of nutritional elements. The appearance of mouth ulcers should be treated in a timely manner, otherwise it will bring greater pain to the human body, mainly by internal and external treatment methods, external drugs mainly include ice borax, watermelon cream, etc. The watermelon cream is mainly a combination of watermelon, mannitol, saltpeter and some other drugs, which can play a role in clearing heat and fire, reducing swelling and relieving pain, relieving severe pain in the wound area caused by local ulcers, and also will be combined with internal drugs, such as vitamin B2. Pay attention to oral hygiene, avoid overwork, resulting in a decline in body immunity, patients should take oral multi-dimensional element tablets during the attack, supplementing the body with a variety of vitamins, microelements to improve immunity. Most patients will improve their symptoms on their own in about 1-2 weeks with medication.