Mouth ulcers should not be cut open with a knife, and it is recommended that patients with mouth ulcers need to take medication and other treatments. Patients with mouth ulcers need to protect the wound, can not be cut with a knife. If the patient has a mouth ulcer with a knife to cut open, may lead to pain in the wound, and when serious, may induce wound infection, easy to aggravate the condition. It is recommended that patients with oral ulcers who experience pain need to use painkillers such as lidocaine gel and compound benzocaine gel, as well as recombinant bovine basic fibroblast growth factor gel, recombinant human epidermal growth factor gel and other drugs to promote wound healing under the guidance of a doctor. For patients with frequent mouth ulcers, immune preparations such as levamisole and thalidomide need to be used as prescribed by the doctor. It is recommended that patients with mouth ulcers need to consult a doctor in a timely manner, you can choose the appropriate medication under the guidance of the doctor and other measures to treat, but can not use a knife to cut open the wound. In addition, patients usually need to keep the mouth clean, every day need to develop the habit of brushing teeth in the morning and evening, to avoid scratching the oral cavity with a sharp instrument.