The elderly have reduced saliva secretion, abnormal taste, atrophy of the oral mucosa, and partial or total loss of teeth, which directly affects the chewing function of the mouth. In order to reduce the adverse effects caused by missing teeth, elderly people with tooth loss should pay attention to diet and nutrition: 1. It is advisable to keep the mouth clean, so that there is less odor in the mouth, which can increase the sensitivity of taste and help to improve appetite. At the same time, the elderly should also be as much as possible fillings, dental implants or dentures, in order to improve the chewing function of the mouth. 2, it is advisable to eat more food rich in vitamins and minerals. Vitamins have a lot to do with maintaining the normal structure and function of tissues and organs. Minerals, especially calcium and phosphorus, have a greater impact on bone quality. 3, it is appropriate to eat easy to chew and easy to digest and nutritious food, can eat more broth, dairy products, eggs and fruit, etc.. 4, add seasonings and condiments to food, the taste should be strong, can stimulate the elderly taste and increase appetite, but the elderly should not consume too much salt and sugar. Chew more when eating to increase saliva, use saliva to increase the sense of taste, use the sense of taste to increase appetite. 5, it is appropriate to eat a certain amount of protein, the daily intake of protein for the elderly 65 grams for women and 75 grams for men is appropriate. According to this requirement to eat sufficient amount of protein, is conducive to the oral support tissue health endurance.