Wearing dentures is not a one-time thing. To avoid excessive wear and tear on the teeth and to prevent dislocation of the jaw joint, full dentures generally need to be re-set with new teeth after 5 to 8 years of wear. Dentures should not only be replaced regularly, but also have a doctor take care of them regularly. This is because before the installation of full dentures, to remove the remnants of bad teeth, wait three months until the alveolar bone resorption tends to stabilize after the installation of dentures. After wearing dentures, the alveolar bone is still absorbing, the alveolar bone becomes “thin”, the denture will appear poor retention, so every 2 to 3 years to maintain the denture. Common dentures are movable and fixed dentures. ① movable denture hard texture, but afraid of falling, afraid of pressure, afraid of baking, but also should not bite too hard, too sticky food, otherwise it is easy to break. Every day before going to bed to take off the movable denture with toothpaste brushing, remove food residues. People who smoke and drink tea will have pigmentation on their dentures, which can be brushed with detergent, but not with a hard brush to prevent damage to the surface structure of the dentures. When not in use at night, soak the dentures in cold water or cool boiling water (do not soak in hot water, alcohol and other organic solvents to prevent deformation, aging and cracking). ② Fixed dentures are dentures with metal crowns, because when worn metal crowns are glued to the adjacent real teeth, can not be freely removed, under the dentures are more likely to retain food residues and bacteria. Therefore, it is necessary to carefully and meticulously clean and brush your teeth after each meal. In case of loosening and pain during use, you should ask your dentist to check and correct them in time.