It’s been a long time since I published an article, so I’m ashamed. Perhaps we can serve you better if we expand the types of articles we publish. According to the report of the International Association of Dental Trauma (IADT), this type of injury occurs mostly in boys between 7 and 12 years old and is most often concentrated in the incisors. The basic principle of on-site treatment is to implant the injured tooth as soon as possible and to preserve it correctly so that the child’s tooth can be successfully reimplanted and restored to its good appearance. The following is a brief introduction to the principles of on-the-spot treatment for dislocated teeth published by IADT in 2012: 1) Calm the injured person; 2) If the tooth is a baby tooth, there is no need for reimplantation; 3) Find the injured tooth, pick it up and hold the crown part; 4) Hold the crown to avoid contact with the root; 5) Do not rinse the tooth with tap water for more than 10 seconds; 6) Encourage the injured person or the parents to implant the tooth back into the socket; 7) Keep the tooth stable after implantation; 8) If it is impossible to implant the tooth, the child should be able to save the tooth. 8.If the tooth cannot be implanted in the socket, it must be placed in a neutral solution to preserve the tooth, such as milk, saliva (oral injury tooth); 9.Do not store in water; 10.Call the emergency number quickly.