Single missing tooth is the most common case of tooth loss, and there are many common causes, such as: dental caries (commonly known as worm teeth), trauma, congenital tooth loss, etc. The main symptoms of missing teeth vary depending on the cause, location and function of the patient. Patients with missing incisors mainly want to solve the problems of aesthetics, pronunciation and cutting food. With traditional fixed restorations, multiple natural teeth of the patient are damaged and multiple teeth are fixed together contrary to the natural tooth movement pattern. In the case of traumatic tooth loss, most of the missing teeth are also accompanied by the loss of alveolar bone, while implant restoration can be done by implanting artificial bone along with the artificial root to restore the natural shape of the alveolar bone and get a more realistic restoration effect without damaging the adjacent teeth. In the case of missing posterior teeth, especially the free end, the traditional fixed restorations are not supported by natural teeth and only movable prostheses can be used. Oral implant restoration can avoid the above unfavorable conditions, and it can greatly satisfy the restoration of chewing function by supporting one tooth with two implants in the missing tooth area with large chewing force and wide gap. This kind of restoration method of filling where is missing is the biggest advantage of oral implant restoration.