After radiotherapy for oral cancer, oral ulcers should consult doctor in time and standardize treatment under doctor’s guidance, such as applying Rehabilitation New Liquid or Compound Chlorhexidine Gargle, and applying antibiotics such as Ceftriaxone if necessary. 1. Oral mucous membrane reaction, such as oral ulcers, can occur after radiotherapy for oral cancer, which is mainly due to the damage caused by rays to the oral mucous membrane, and the mucous membrane is edematous and ulcerated. In mild cases, local spraying of rehabilitation liquid can be used to promote mucous membrane repair, and gargling of compound chlorhexidine mouthwash can be used to keep the oral cavity clean. 2. The more serious symptoms, can be applied intravenously antibiotic anti-inflammatory, such as ceftriaxone sodium, etc., need to do skin test before use. In addition, we should always keep the mouth clean, rinse the mouth after meals, pay attention to light diet, do not eat too hot food, reduce mucosal irritation. It should be noted that the drugs used need to be used under the guidance of a doctor.