Under normal conditions, each tooth has a certain physiological motility to cushion the chewing pressure and prevent the teeth from being traumatized. When doing corrective treatment, the tooth looseness increases, which is a normal reaction. However, after the orthodontic treatment stops moving to the normal position, the teeth can be stabilized by their own repairing ability without permanent damage. However, if the clinical operation is not regular, the force is too large or the oral hygiene is not good during the treatment, the height of the alveolar bone is significantly reduced, and there is the possibility of loosening after correction. Therefore, correction must go to a regular hospital and find an experienced correctional doctor.