Children’s mouth ulcers may be related to genetics, trauma, diet, mental state, immunity and other factors, when the child’s mouth ulcers pain can not eat, parents can give the child topical medication to relieve the pain, prepare fluid or semi-liquid food, in order to promote the recovery of mouth ulcers. 1. topical medication: the child mouth ulcer pain unbearable, can not eat meals, can follow the doctor’s instructions for local use of lidocaine gel and other drugs to relieve pain, at the same time you can use chlorhexidine gluconate gargle to clean the oral cavity, in addition to the use of watermelon cream and other medications to help mouth ulcers to recover. 2. Preparation of appropriate food: the child mouth ulcer pain can not eat meals, parents can give the child to prepare soup, porridge and other fluids, semi-liquid food, vegetables and fruits into juice, to reduce the child’s oral chewing frequency, to relieve the child’s pain, to help the recovery of the disease. 3. Let the child more exercise: usually let the child adhere to the exercise, slowly improve the resistance, reduce the incidence of mouth ulcers. When the child’s mouth ulcer pain can’t eat, it is recommended that parents take the child to the regular hospital in a timely manner, in accordance with the doctor’s instructions for targeted treatment, so as not to miss the opportunity for treatment.