The causes of tooth loss include dental caries, periodontal disease, periapical disease, trauma to the jaws and alveolar bone, jaw disorders, and developmental disorders. In the current situation, the most common causes are caries, periodontal disease and trauma. When teeth are missing, if not restored in time, it will bring many effects, mainly in the form of local effects, tilted displacement of adjacent teeth on the side of the gap, and even loosening. Long-term, multi-tooth loss not only causes local dysfunction, but also may affect the health of the whole body, as well as social and psychological impact. The common effects are: 1.Decrease in masticatory function; 2.Alteration of periodontal tissue; 3.Dysfunction of pronunciation; 4.Aesthetic effects of temporomandibular joint lesions; 5.Aesthetic and psychological effects.