The main function of teeth is to chew food, and missing teeth can cause varying degrees of reduced chewing function, increasing the burden on gastrointestinal digestive function, leading to malnutrition and affecting the health of the whole body. It can also produce dysarthria, increase facial wrinkles and affect aesthetics. When an elderly person is missing teeth, it is important to consider the whole body condition to decide whether to restore. If the patient cannot tolerate the treatment operation, or suffers from severe oral mucosal disease or untreated malignant tumor, restoration is not advisable. Or when the third molar is missing or the gap between missing teeth becomes small, which has no effect on chewing, pronunciation and aesthetics, and does not cause damage to the remaining teeth or temporomandibular joint, restoration is not necessary, except that all missing teeth should be restored in time. An ideal restoration should meet the following conditions: good biocompatibility with oral tissues, no adverse stimulation, and easy adaptation by the body. The anatomical shape of the prosthesis contributes to oral hygiene and is easy to self-clean. It can restore the normal function of the oral cavity, restore the integrity of the dentition, reconstruct a good occlusal relationship, and not overload the remaining teeth and the covered tissues with trauma. Finally, the shape of the restoration should be aesthetically pleasing and compatible with other teeth, muscles, TMJ and facial appearance.