The trauma to the baby tooth is divided into complete dislocation, partial dislocation, and embedded dislocation, as follows: 1. Complete dislocation, i.e., replantation within 30 minutes, can avoid root resorption and pulp inflammation in 90% of patients, so the tooth should be placed in its original position immediately after dislocation. If the tooth has fallen on the ground, i.e. after being contaminated, it should be rinsed with saline or sterile saline and put into the original position. If the tooth cannot be reset immediately, the affected tooth can be placed in the patient’s sublingual or anterior labial sulcus or in a cup filled with milk or saline, avoid drying, and go to the hospital as much as possible; 2. Partial tooth dislocation should be reset and ligated and fixed under the effect of local anesthesia, and the patient should be instructed to follow up, and if the pulp is found to be necrotic, root canal treatment should be performed in a timely manner; 3. Embedded tooth dislocation, embedded tooth dislocation should The embedded tooth dislocation is usually accompanied by pulp necrosis, and root resorption can easily occur. The embedded dislocation should not be forcibly pulled out and reset to avoid causing damage to the permanent tooth embryo.