It is recommended that dentures (prosthetics) be placed about three months after tooth extraction for periodontal disease. After tooth extraction for periodontal disease, it usually takes three months for the wound to heal completely and the alveolar bone to return to a stable state; therefore, denture restoration should be carried out three months after tooth extraction in order to facilitate the long-term retention and stability of the denture. If it is too early, the physiological resorption of the alveolar bone will occur, making the denture and the surrounding tissues appear gaps, and if it is too late, it will lead to tilting and elongation of the neighboring teeth and so on. The specific healing of the wound after tooth extraction varies from person to person, especially periodontal disease will lead to a relatively longer recovery time for the wound; therefore, it is recommended to choose the appropriate time for denture restoration according to the actual recovery condition.