Each person has 32 permanent teeth, and the teeth that really perform their function are 28. When the teeth fall off 1 to 2, does not affect the health of the whole body, but the teeth gradually fall off less than 20 left, it began to affect the function of the body’s multiple systems. At this time, if the lost teeth in time to repair, the mouth to maintain more than 20 functional teeth, the speed of aging will slow down, in favor of prolonging the life of people. This is because when a person has less than 20 teeth, food can not be fully chewed, which will affect the digestive function: speaking pronunciation will be adversely affected, the appearance will also look old. This can have a negative impact on the human psyche. In addition, the teeth or the body’s important balance organs, many of the physical activities and attention to mental labor need to bite the teeth to cooperate. When there are fewer than 20 teeth, a person’s balance function is affected, and it is easy to make mistakes in activities and fall down. Periodontal disease is caused by the loss of teeth in the elderly “culprit”] Periodontal disease is the periodontal organization of various types of diseases, mainly a variety of gingivitis, gingival hyperplasia, periodontitis, periodontal atrophy, etc. It is a chronic disease of the tissues around the teeth, the periodontitis is a kind of chronic disease. It is a chronic destructive disease of the tissues around the teeth, usually bleeding gums as the main symptom, manifested as bleeding when brushing teeth, morning saliva with blood, swollen gums, bad breath, gum recession, teeth allergic to stimulating food, etc., with the aggravation of the lesions will be pus flowing from the gums, chewing weakness, tooth looseness, during the period of recurring periodontal abscess, and ultimately lead to the whole mouth of more than one tooth looseness, loss of teeth. Periodontal disease is the most common cause of periodontal disease in middle-aged and elderly people. Periodontal disease is the main cause of tooth loss in middle-aged and elderly people. Periodontal disease is the main cause of tooth loss in middle-aged and elderly people. Periodontal disease is the main cause of tooth loss in middle-aged and elderly people. Periodontal disease is the main cause of tooth loss in middle-aged and elderly people. Periodontal disease is the main cause of tooth loss in middle-aged and elderly people. 1, the elderly pneumonia and periodontal disease: many bacteria in the mouth can be inhaled into the lungs, resulting in pneumonia. According to the survey: poor oral hygiene is prone to periodontal disease, the occurrence of chronic lung infections and reduced lung function is 2 times the chance of good oral hygiene. 2, cardiovascular and periodontal disease: periodontal bacteria produced by the enzyme can promote the formation of blood clots in the body, periodontal bacteria into the blood, will prompt the human body to produce a role similar to the role of platelets colloidal proteins, the formation of blood clots, blocking blood vessels, leading to heart disease and stroke. There are reports that: periodontitis patients with coronary heart disease and the chances of stroke were 1.4 times and 2.1 times the periodontal normal people. 3, digestive diseases and periodontal disease: Helicobacter pylori is the causative agent of chronic gastritis, gastric ulcer and even gastric cancer. In recent years, researchers have detected H. pylori in dental plaque and saliva, and the detection rate of H. pylori in the plaque of patients with periodontal disease is significantly higher than that of periodontal health. [Develop good oral hygiene habits to fully maintain oral health] Warm reminder: morning and evening brushing is very important, brushing after each meal is more worthy of promotion. Brush your teeth with fluoride toothpaste and health toothbrush to remove plaque, maintain periodontal health and prevent dental caries. Adopt the correct brushing method: brush vertically up and down the gap between the teeth to remove food debris and massage the gums. Avoid sawing horizontal brushing to prevent wedge-shaped defects in the neck of the teeth. Advocating the use of mouthwash, brushing teeth mainly to clean the surface of the teeth of the soft dirt and plaque, other parts of the oral cavity can not play a sufficiently clean role, these parts are also the cause of oral diseases, the appropriate use of mouthwash on the overall cleaning of the oral cavity has a certain role. Usually should quit smoking and drink less alcohol. Drink more water to prevent dry mouth, eat more vegetables and fruits, after meals should be clean denture (denture), before going to bed to remove the mouth removable denture, and soaked in water or denture cleaning solution. For middle-aged and elderly people with serious diseases, such as Alzheimer’s disease and hemiplegia, special oral care should be provided by family members or medical personnel on a regular basis.