How long it takes for a knocked loose tooth to heal itself depends largely on the extent of the damage to the tooth. If the degree of loosening of the tooth is small, and there is no pressure root, fracture of the alveolar bone, usually about 1-3 months will gradually recover. When a tooth becomes loose, it is recommended to go to the hospital stomatology department in time for a comprehensive examination. Under the guidance of a professional doctor, an X-ray of the tooth can be taken if necessary to observe whether the root of the tooth is broken or cracked, and whether there is any damage to the nerve of the tooth. If the symptoms are mild, usually no special treatment is needed and the tooth can recover gradually. However, if the looseness of the tooth is too great, or even if there is damage to the nerve of the tooth and recurring pain will occur, it will take a longer time to recover, or may not be possible to recover, and therapeutic measures will be required. In daily life, it is recommended that patients eat mainly soft food to avoid too hard food to stimulate the teeth, making the loosening more serious, and at the same time pay attention to maintaining oral hygiene, rinse the mouth diligently, so as to avoid oral inflammation and aggravate the condition.