Loose permanent teeth may be due to dental trauma, apical periodontitis, etc. Treatment measures such as grinding of opposing teeth, repositioning of permanent teeth, root canal treatment, etc. can be taken for different reasons and with different treatment methods. 1. Adjusting and grinding the opposite teeth: If an accidental injury occurs, resulting in periodontal concussion of the permanent teeth, you can adjust and grind the opposite teeth, reduce the occlusal contact, avoid using the affected teeth to gnaw and eat hard objects, and the periodontal membrane will return to normal after the swelling of the periodontal membrane subsides in 3-4 weeks. 2. Reset the permanent teeth: If the permanent teeth are semi-dislocated or completely dislocated, the permanent teeth can be reset in the alveolar fossa under local anesthesia, and full (alveolar) pads can be made for fixation, and the (alveolar) pads can be removed after the roots of the teeth have been stabilized in 2-3 months. 3. Root canal treatment: If acute apical periodontitis occurs in permanent teeth, causing obvious swelling of the gums, accompanied by pus overflow, root canal treatment can be carried out to remove the infected pulp, applying 3% hydrogen peroxide solution to rinse the root canals, and using calcium hydroxide paste to seal the canals, to induce continued development of the roots. It is recommended that children should also pay attention to oral hygiene during the treatment period, and at the same time should avoid eating spicy and stimulating food, which is conducive to the recovery of permanent teeth.