Children often mouth ulcers may be caused by improper diet, lack of resistance, viral infections and other reasons, can be improved through a reasonable diet, physical exercise, medication and other methods. 1. Improper diet: children’s daily diet leads to a long-term lack of vitamin B and other substances triggered by mouth ulcers, should be reasonable arrangements for children’s diet to eat more fruits and vegetables, animal liver, eggs and other foods to supplement the nutrients. 2. Insufficient resistance: when children’s own resistance is too poor, the immune system functions poorly, often causing various problems such as mouth ulcers. You can strengthen your resistance through physical exercise, and mouth ulcers won’t appear so often when your physical condition rises. 3. Viral infections: Viral infections caused by oral hygiene and other reasons lead to frequent mouth ulcers in children, which can be treated by taking drugs such as lysozyme enteric-coated tablets. Children with frequent mouth ulcers should consult a doctor for diagnosis, identify the specific cause, and take appropriate measures to improve the situation according to the doctor’s recommendations. Exercise regularly, pay attention to balanced nutrition, drink more water, and use medication as prescribed by a doctor.