Repeated mouth ulcers in children may be caused by poor eating habits, lack of oral hygiene and lack of vitamins. If you usually like to eat snacks and spicy and stimulating food, it is easy to trigger the occurrence of mouth ulcers, so you need to adjust your diet in time and eat more vegetables and fruits. Usually do not pay attention to oral hygiene may lead to bacterial growth in the mouth caused by mouth ulcers recurrence, if there is a bad tooth to timely repair, at the same time pay attention to clean the oral cavity. If the diet is not reasonable and lead to vitamin deficiency, may also lead to decreased immunity and lead to recurrent ulcers, so pay attention to balanced nutrition. Recurrent mouth ulcers in children may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.