In general, it is recommended that elderly people with missing teeth undergo early restorative dental treatment to restore chewing, pronunciation and aesthetic functions as soon as possible. For example, if the second molar is missing, if the opposite tooth is also missing, it may not be restored if it does not affect chewing, or if the original tooth has misaligned teeth and the gap between the missing teeth is too small, it may not be considered for restoration, and missing wisdom teeth are generally not restored. The World Health Organization’s standard for dental health is 8020, that is, 80 elderly people should have at least 20 functional teeth, less than 20 human teeth, food can not be fully chewed, affecting the digestive function, speech pronunciation will also be adversely affected, the face will also look old, and will have a negative impact on human psychology and even behavior. According to this criterion, missing teeth can be left unrestored under certain circumstances.