Mouth ulcers in children are commonly recurrent aphthous ulcers and traumatic ulcers. Children’s mouth ulcers are first treated by identifying the cause and removing the causative factors, followed by local symptomatic treatment. Recurrent Aphthous ulcers, most of which have a genetic component, are common in the pediatric population. Twenty percent of children suffer from this disease. It is important to drink more boiled water, eat more fresh fruits and vegetables, eat a light, easily digestible diet, and keep the bowels open during an ulcer attack. You can apply pain-relieving and anti-inflammatory medications to the ulcer, gargle with Rehab, and apply trimethoprim oral ointment or epithelial growth factor gel to promote ulcer healing. Be sure to seek professional medical attention. For specific medication, please combine with clinical, subject to the guidance of the doctor’s face-to-face consultation. Most ulcers in children’s mouths are traumatic ulcers caused by local mechanical irritation and bad habits. There are mainly the following cases: local ulcers can be formed due to the stimulation of the gum and mucous membrane by the inflammation of the crown, root and root tip due to the development of dental caries to the dental pulp and then further spread to the root tip; children can also cause the so-called “self-inflicted ulcers” due to bad habits, such as habitually biting the soft tissues of the tongue, lip and cheek or stimulating the above soft tissues with fingers or foreign objects. “. When treating traumatic ulcers and “self-injurious ulcers” in children, it is especially important to remove the causative irritants and bad habits, in addition to the local application of symptomatic drugs. Finally, parents should be reminded that their children should go to the hospital promptly when ulcers appear.