A minimum of 2 and a maximum of 4 implants are required for 4 teeth. The number of implants is not only related to the number of missing teeth, but also related to the internal factors of the mouth and physical factors. 1. The number of implants needs to be judged by the doctor in conjunction with the number and specific location of the missing teeth, oral condition, physical fitness and so on. Generally missing 1~2 teeth, then need to implant 1-2, but missing 3 and above, if the adjacent teeth are missing, in the implant can be used in the way of connecting the bridge for implantation. Mouth full of dental implants generally only planted 10 or so. 2. The patient’s oral condition is to consider the oral bone condition, bite force distribution and the number of surviving natural teeth in the mouth. The physical quality of the patient determines the final number of dental implants required, such as elderly patients in the full mouth dental implants only 4 to 6 dental implants, but the younger patients in the number of implants will be more. 3. Oral implants, also known as dental implants or artificial tooth roots, are surgically implanted into the upper and lower jaws of the human body at the site of the missing tooth, and after the surgical wound has healed, a prosthetic device is mounted on top of it. In the case of two or more missing teeth, a prosthodontist should first design the restoration, and then select the implant site according to the restoration design. If the patient is in need of an implant, it is recommended to go to a regular hospital to receive consultation from a specialist to avoid delays.