“Veneers” is the medical term for restorative dentistry. It includes the restoration of dental defects and missing teeth. In recent years, the main materials used to make dentures are: all-ceramic porcelain, plastic, and metal. Due to the different ways of retaining dentures in the oral cavity, the restoration of missing teeth is divided into two types: movable denture and fixed denture. Fixed denture (denture), is the use of missing teeth gap adjacent to the two sides or one side of the natural teeth for support, the patient can not take off a kind of denture. It can restore a high chewing efficiency, and has the advantages of comfort, no foreign body feeling, does not hinder the development and aesthetics. However, a certain amount of teeth on both sides of the missing teeth need to be removed when making a fixed denture. The movable denture (denture) is a kind of denture that can be freely taken and worn by the patient by using natural teeth, mucous membrane and bone tissue for support and relying on the retainer and abutment of the denture. The “removable denture” has a wide range of adaptability and can repair defects in any part of the dentition and alveolar ridge, and the number of missing teeth can range from one missing tooth to multiple missing teeth or even the whole mouth. It can restore the lost oral physiological function, correct the occlusal disorder caused by tooth loss, protect the health of remaining teeth and alveolar bone, as well as prevent and correct temporomandibular joint diseases and facial deformities, etc. In addition, “removable denture” removes less tooth tissue, is easy to wash and brush, can better maintain oral cleanliness, easy to repair and add fillings, and The cost is lower. The disadvantage is that the size of the denture is large and there are many parts, so the first wearer often feels foreign body, has difficulty in pronunciation and even causes nausea, and the chewing efficiency is not as good as fixed denture. In addition to the above-mentioned characteristics, the choice of the type of denture is also related to the various conditions of the patient and should be considered comprehensively.