Removable partial denture is a kind of denture that is widely used, basically the indications are very wide, and the non-indications are very few, there are several major categories: first, the patient is mentally ill, because this category of people may not have the ability to act, he may have the risk of swallowing the denture; second, the patient has a strong sense of foreign body, can not adapt to it, but this kind of patients are also very few; third, serious diabetic patients, gum Fourth, patients with serious mucosal diseases, such as lichen planus, and various mucosal diseases, the cause of which is not clear, and mucosal ulcers when they eat, cannot be worn. In general, removable partial dentures are widely available and are generally considered to be wearable by most people, but not by very few people.