The pile mentioned here is the implant of implant denture, two adjacent missing teeth are generally based on the amount of bone in the implant area and the patient’s general condition and other factors to decide whether to use one implant or two implants, as follows. 1. If the bone volume in the implant area is insufficient to meet the requirements that the distance between the axes of two implants is more than 6~8mm and the distance between the implant and the adjacent natural teeth is more than 1.5mm, or the patient’s general health condition is unable to tolerate the trauma caused by the surgery of implanting two implants, then the patient can choose to implant a single implant, i.e., to use implant restoration for one missing tooth, and to use a fixed local prosthesis to restore the other missing tooth. 2. If the amount of bone in the implant area meets the above requirements and the patient can withstand the implant surgery, two implants can be placed to restore the two missing teeth with implant denture. For the same disease, different patients have different conditions and different treatment options, so it is recommended to go to the hospital and receive professional treatment.