How long it takes for a tooth to recover after being knocked loose cannot be generalized, but is mainly related to the site of the tooth injury and the degree of the injury. The loosening caused by dental trauma can be generally classified according to the site and degree of injury: 1, tooth shock: mainly manifested as minor knocking pain and loosening, generally do not require dental fixation, can be adjusted to reduce the bite burden of the teeth, most of them can recover on their own in about 2 weeks. 2, partial dislocation: generally have more obvious pain, loosening or displacement, often accompanied by the elongation or embedding of the affected tooth, most of them need root canal treatment and reset fixation, generally can be stabilized in about 4 weeks. 3, Root fracture: there are symptoms of tooth loosening, knocking pain, etc., generally need to be fixed for 3 months. It is recommended that after the tooth is loosened due to trauma, try not to eat with the affected tooth, especially hard food, and seek medical examination as soon as possible, and carry out different treatment according to the different types of injury.