If the child’s old teeth have not fallen out and the new teeth have grown out, the looseness of the old teeth can be checked and treated separately after taking whole-mouth surface tomography films, as follows: 1. If the roots of the baby teeth have not been completely absorbed and the crowns of the permanent teeth are initially exposed in the mouth, the child can be allowed to chew more tough-textured food, such as beef, to speed up the absorption of the roots of the baby teeth, which should preferably fall out on their own. 2. If the roots of the baby teeth have been completely absorbed and only the If the crown of the baby tooth is completely absorbed and only the crown is attached to the gum, and the crown of the new tooth reaches the occlusal plane, the crown of the baby tooth can be extracted directly by rubbing bupivacaine on the mucosal surface to encourage the permanent tooth to move slowly to its normal position. 3. If the x-ray shows that the baby tooth has periapical inflammation and forms root bone adhesions with the surrounding area, the baby tooth needs to be extracted after local anesthesia to avoid crowding and misshapen jaws, etc.