After a clinical extraction, the soft tissue wound of the extraction wound heals in about a week, and to achieve complete bone healing, it is usually not largely completed until about six months after the extraction. During this healing period, blood clotting, clot mechanization, granulation tissue formation, connective tissue formation, bone resorption and bone reconstruction occur within the extraction wound. Approximately 24 hours after tooth extraction, clot mechanization begins to occur and granulation tissue gradually forms. About 20 days after extraction, the granulation tissue is gradually replaced by more mature fibrous connective tissue, while resorption and reconstruction of the alveolar bone occurs. About three months after extraction, all bone tissue is formed in the alveolar sockets, but at this time the bone density is low and the bone tissue is not mature. About six months after tooth extraction, bone reconstruction is basically completed and normal bone tissue is present, which is the time of complete healing of the extraction wound.