If a tooth becomes loose due to trauma, the patient should visit a regular dental hospital or the dentistry department of a general hospital as soon as possible to take x-rays and examine the roots of the tooth and the surrounding alveolar bone. If the roots are intact and not broken, the traumatized tooth can be fixed by certain therapeutic measures and the loose tooth can be preserved as much as possible. If the tooth is not seen in a timely manner, the loose tooth from traumatic injury may be further aggravated by occlusal forces and other reasons, leading to tooth loss. In severe cases, if infection occurs, it may lead to resorption of the alveolar bone of the surrounding healthy teeth, endangering the surrounding healthy teeth. If the examination reveals a fractured root, it is necessary to decide whether the tooth should be retained or not depending on the location of the fractured root. If the fracture occurs in the upper 1/3 and middle 1/3 of the root, the traumatized tooth needs to be extracted; if the fracture occurs in the apical 1/3 of the root, the tooth should be treated according to the specific situation and this tooth should be retained as much as possible.