A loose tooth with periapical periodontitis can recover if the inflammation is mild, and there is a possibility that it will not recover if the inflammation is severe enough to damage the surrounding bone. 1. It can be restored. Apical periodontitis, due to the apical part of the inflammation exudation, under the influence of inflammation, the tooth will have different degrees of loosening, generally more limited inflammation, through the root canal treatment, the inflammation slowly dissipate, the looseness will be gradually restored. 2. Cannot be restored. If the inflammation of periapical periodontitis is more serious, the inflammation has caused the destruction of bone, or caused periodontal lesions of the pulp, the tissues around the root of the tooth are damaged, after root canal treatment, the damage can not be self-healing, the looseness will not disappear. The presence of apical periodontitis is recommended to be treated in the hospital as soon as possible to avoid the inflammation expanding and leading to periodontal damage.