With age, all organs and tissues of the body will gradually degenerative changes, the oral environment is also one of them. Oral diseases caused by wear and tear of teeth, thinning of mucous membranes, and decreased secretion of salivary glands often plague middle-aged and elderly people. If accompanied by smoking and drinking and other bad habits, will increase the incidence of oral diseases. Many middle-aged and elderly people have a long history of insufficient knowledge of oral hygiene and health care, or for various reasons do not pay attention to oral hygiene, do not brush their teeth every day or only brush their teeth once. With the development of the economy and improved awareness, middle-aged and elderly people are paying more attention to the quality of life and oral hygiene, but the underlying conditions of oral diseases have changed. So it is still important to prevent the disease before it occurs. Among the oral diseases, caries and periodontal disease, which have the highest incidence rates, are also detected at a fairly high rate in the middle-aged and elderly population. Periodontal disease, in particular, has become the leading cause of tooth extraction among adults in China. Periodontal disease is a disease that occurs in the supporting tissues of the teeth. If there is tartar and plaque around the teeth, it can lead to an inflammatory response and a gradual receding of the gums, much like soil erosion. Without healthy periodontal tissues, teeth cannot be held in place, bleeding from brushing, weak bites, food impaction, and inadequate chewing. When the body’s resistance is lowered or accompanied by consumptive diseases such as diabetes, it can also aggravate the swelling and pus overflow of the periodontal tissues, and in severe cases, it can trigger the onset of other systemic diseases. Full mouth cleaning is the basis for removing tartar and plaque from around the teeth, controlling the progression of periodontal disease, and is the most effective treatment. At the same time, the gums recede and the roots are gradually exposed. Without enamel protection around the roots, it is very easy for caries to occur, slowly eroding the root surface of the teeth, which may progress into pulpitis, causing tooth pain, and can also progress gradually into periapical periodontitis, or even tooth fracture. If you have an oral examination every six months and fill the decayed tooth in time, you can effectively terminate the progression of caries. Caries and periodontal disease at the same time, will cause middle-aged and elderly people missing teeth. If the teeth are not set in time, it will not only increase the burden of the remaining teeth, but also change the direction, misaligned teeth, bad bite, thus reducing the efficiency of mastication, affecting digestion and absorption and general health. In the clinic, it is also common to see middle-aged and elderly people suffering from dentin sensitivity, especially in the winter, when the temperature drops, the cool water when brushing teeth or the cool wind when walking in the morning can cause tooth soreness. This is because the teeth after decades of use and wear and tear, the teeth outside the hard enamel gradually wear down, sensory nerve endings fiber-rich dentin tubules directly exposed to the oral environment, unable to resist hot and cold sweet and sour stimuli. There are also some middle-aged and elderly people, due to incorrect brushing method, the choice of toothbrush and too large and too hard, resulting in a wedge-shaped defect in the neck of the teeth, will also make the teeth can not tolerate the temperature and stimulus changes. Once the teeth appear to be more sensitive to hot and cold stimuli, you need to visit a dentist to repair the chipped teeth. The oral mucosa and soft tissues of middle-aged and older adults also undergo age-related changes as they age, and may become atrophied, thinned, pale, dry and less elastic. These changes are also responsible for the development of oral mucosal diseases specific to older adults. Smoking and alcohol abuse, stumps and crowns, environmental pollution, radiation, genetic factors, etc., also threaten the health of the oral mucosa and soft tissues. Older people should pay attention to oral health care and develop good oral hygiene habits. Regular checkups, early intervention, can be timely detection of oral lesions, effective control of the further development of disease, physical and mental health can play a multiplier effect. Every morning and evening with a health care toothbrush to effectively brush your teeth, use dental floss to clean the gap between the teeth after meals, go to the hospital for a regular checkup of the oral cavity, regular cleaning of tartar, quit bad habits, timely repair of missing teeth, etc., these measures can effectively maintain oral health. Having and maintaining a healthy mouth can help people fully chew their food and enjoy the delicacies; as an important gateway to the digestive tract, it helps other organs of the digestive system to provide valuable nutrients to the body; and reduce the occurrence of systemic diseases. A healthy mouth enables a person to fully express his or her intentions and communicate better with others, thus emphasizing self-esteem and self-confidence in interpersonal interactions. As long as middle-aged and elderly people can fully recognize their own oral problems, understand the importance of oral health, and take positive action to care for and protect the oral cavity, will be able to enhance general health and improve the quality of life.