Traumatic dental injury refers to acute damage to periodontal tissue, pulp tissue and hard tissue of the tooth that occurs when the tooth is subjected to various mechanical external forces. Children have more extracurricular activities and lack of self-protection awareness, while trauma to the anterior teeth is most common due to the soft prominence of the anterior tooth position. If left untreated or improperly treated, it can lead to abnormal jaw bone development, tooth misalignment, and pulp tissue necrosis. When dental trauma occurs, it is important to seek medical attention in a timely manner; the more timely the treatment, the better the results. The more common after dental trauma is the tooth fracture loose, the child pain obvious, can not eat. Parents should not be overly nervous, rinse the mouth with water to remove blood and impurities. Do not wipe the broken tooth or shake the tooth by yourself, as this will aggravate the child’s pain and fear, which will have a negative impact on the subsequent treatment. The more timely the treatment, the better the prognosis. For permanent teeth that are completely dislocated, the longer the tooth is out of the socket, the worse the prognosis is, so immediate replantation of the tooth is necessary. If it is not possible to go to the hospital in time, the affected tooth can be implanted in the socket after being gently rinsed with water by parents or teachers. For dislocated teeth that cannot be reimplanted by themselves, they can be kept in milk or saline and then go to the hospital in time. It is not recommended to keep the dislocated tooth in the child’s mouth, because the child may swallow the tooth or aspirate it by mistake due to nervousness.