The oral characteristics of the elderly: all the tissues and organs of the oral cavity of the elderly have obvious degenerative changes due to age factors, manifested as a decline in bone density of the jaw bone, alveolar bone resorption, thinning and atrophy of the mucosa and gingiva; more defective and missing teeth, a large number of residual roots and crowns in the mouth, the remaining teeth also have excessive wear, morphological changes, narrowing and small pulp cavity, thinning of the root canal, and even atresia, prone to root fracture, tooth fracture; The soft tissues of the oral and maxillary system and the salivary gland system of the temporomandibular joint also have degenerative changes. The most prominent manifestations are: 1, the dental curve is abnormal. The functional cusp of the posterior teeth is heavily worn, staggered missing teeth, elongation of the opposing teeth; the compensatory growth of alveolar bone in the remaining tooth area and heavy atrophy of alveolar bone in the missing tooth area coexist, as well as poor chewing habits, which can cause the longitudinal and transverse dentition curves of the teeth to be abnormal. The abnormal dental curve can destroy the stability of the orthodontic occlusal position, affect the normal structure and symmetry of the temporomandibular joint (TMJ), and cause occlusal trauma, periodontal disease and masticatory muscle dysfunction. 2. The vertical distance of occlusion is reduced. In the elderly, the vertical distance of occlusion decreases significantly due to heavy tooth wear, loss of the free ends of bilateral posterior teeth, staggered missing teeth in the upper and lower jaws, resulting in the loss of median occlusal support, as well as severe atrophy of the alveolar bone and poor jaw repair. The low occlusal vertical distance makes the patient chew weakly, and the patient tends to bite the cheek, tongue and gums when biting. Restoration method: When treatment plan is made for the elderly, the design and production of restorations in the treatment should fully consider the characteristics of the elderly, and the prosthodontist should make a practical and acceptable plan for both the patient and the doctor after considering the patient’s oral disease, systemic history, the patient’s and family’s ability and cooperation. The prosthodontist will carry out the reconstruction of the dentition and the dentition in order to restore the proper occlusal function. The implementation of the restoration plan should take into account both the oral condition of the elderly and the effectiveness of the denture in the oral cavity of the elderly patient. The choice of oral prosthetic methods Plastic removable partial dentures are usually worn for a short period of time because of their poor mechanical properties, uncomfortable wear, and detrimental to oral hygiene. However, because it is relatively inexpensive and easy to modify, it is easier to modify additional teeth when other teeth are subsequently extracted and restored. As a temporary denture for elderly patients, it is beneficial for patients to adapt to a full denture in the future. Compared with removable partial denture, fixed denture is smaller, non-foreign body, comfortable, does not interfere with pronunciation, and does not need to be removed and worn by the patient, and is comfortable to chew. When choosing a restoration method for elderly patients, the patient’s general condition, oral hygiene, and the condition of the remaining teeth should be taken into consideration. Treatment: Treatment of low vertical distance of occlusion When dealing with this type of patients, one is to remove occlusal trauma and soft tissue damage, and the other is to restore a reasonable vertical distance of occlusion within the patient’s adaptation range. Clinically, if there are more missing teeth and fewer remaining teeth, or if the relationship of the original occlusal vertical distance is lost, the occlusion can be raised appropriately; if there are individual missing teeth, and there are no symptoms of joint symptoms and heavy wear caused by dentin hypersensitivity and food impaction in most teeth, the occlusion can not be raised; if there are more remaining teeth and accompanied by the above symptoms, the occlusion can be raised. As the elderly are not easy to adapt to the raised occlusion, if necessary, a transitional denture can be used first, and the final denture can be replaced after the vertical distance of the occlusion is adjusted appropriately. Poor curves are mainly due to the difficulty in achieving occlusal balance after the prosthesis. Therefore, it is necessary to perform pre-prosthetic occlusal resharpening and then further release the occlusal trauma through the prosthesis to restore the stability of the orthodontic occlusal position and the symmetry of the TMJ. Most patients with TMJ and masticatory muscle dysfunction have unstable median occlusal position or bilateral TMJ asymmetry. A stable occlusal relationship is also the basis for restoring masticatory function and improving masticatory efficiency. Therefore, special attention should be paid to correct their poor chewing habits. Interdental food impaction: Due to gum atrophy, periodontal disease, tooth loss, heavy wear of tooth surface, irregular teeth, abnormal occlusal relationship and poor restoration, the elderly often cause interdental food impaction, which not only affects the health of periodontal support tissue, causing more gum atrophy and alveolar bone resorption, but also hinders normal eating, bringing pain and anxiety to patients. In the restoration of missing teeth, the physician should pay attention to the design of anti-embedding of the food-embedded parts, the longitudinal type can be solved by dental filling. In the case of multiple gaps, removable cast brackets or dental pads can be used. Transverse type: When the gingival recession of anterior teeth and premolar teeth is accompanied by wedge-shaped defect, photosensitive resin can be used to repair both the wedge-shaped defect and the triangular gap below some adjacent points. In the case of multiple gaps in the anterior teeth, gingival prostheses are also used. The posterior teeth can be restored with a continuous dental retainer plus a buccal interdental triangle and a periodontal splint, as appropriate. In conclusion, the elderly have their own peculiarities in terms of physiology, pathology and psychological state. In order to obtain good restorative results for the elderly with dental defects or loss, the dentist must not only have good systematic knowledge and professional skills, but also be good at grasping the main contradiction and the key to the problem. In the whole restoration process, attention should be paid to the mutual balance of the whole body and local, the mutual cooperation of treatment and care and the mutual combination of treatment and prevention, constantly changing the treatment conditions of oral diseases in the elderly, summarizing clinical experience, and continuously exploring for the development of geriatric dentistry.