When the wound has not yet healed after trauma or tooth extraction, usually one to one and a half months after the extraction of incisors and one and a half months to two months after the back teeth, the wound can be flattened before the placement of teeth. After premature placement of dentures, the wound is still being absorbed and the future dentures will not fit. At the same time, missing or missing adjacent teeth have not been perfectly treated, the oral local mucosa has inflammation, ulcers, etc. is not easy to set teeth; abutment teeth have just been treated, in order to observe the efficacy, should be suspended (such as root canal treatment requires 1 to 2 weeks before setting teeth).