One year after tooth extraction, implantation is possible. Before the surgery, detailed oral examination should be carried out, whole mouth surface tomography and oral CT should be taken. if the top of the alveolar ridge is closer to the bottom of the maxillary sinus, internal or external elevation should be carried out. if the alveolar bone is heavily atrophied, and the height and width are insufficient, it is necessary to cut open the gingiva, turn over the soft tissues, and place the bone powder and periosteum inside the alveolar bone, and the titanium mesh is necessary to be used to strengthen the bone when the bone is more heavily missing, and the bone will heal in three months before completing the implantation surgery. The implant surgery is completed after three months of bone healing. If there is enough bone in the missing area, a small amount of gingiva can be removed directly with a circular ball drill, a hole is prepared and an implant is inserted, and a crown is made to connect the implant to the implant after the implant has formed a stable osseointegration with the surrounding bone in 3-6 months.