China is gradually entering an ageing society, with an increasing proportion of the elderly population. How to improve the quality of life of the elderly has become an issue of general concern to society as a whole. The connotation of improving the quality of life is multi-faceted, but for the elderly, how to maintain or improve physical health should be the top priority. “A full mouth and a smiling mouth” are all directly related to the oral cavity. The health of your teeth affects everyone’s daily life in ways that relate to eating, pronunciation, aesthetics, and even self-confidence when socializing. What are the characteristics of oral health care for the elderly and what should be paid attention to, the following is described in several cases. Older people who are now retired or of comparable age did not take good care of their teeth in their younger years due to the limitations of the conditions at that time. Caries, commonly known as insect teeth, is very common in this group. This is mainly due to the acids produced by bacteria that erode the teeth and form holes of varying sizes on the surface of the teeth. Smaller holes can lead to symptoms such as hot and cold sensitivity and congestion, while more serious ones can lead to pulpitis or periapical inflammation. As the old saying goes, “Toothache is not a disease, but a pain that kills”. Tooth decay should be treated as soon as possible to prevent further deterioration. Endodontitis and periapical periodontitis should be treated with root canal therapy, which is often referred to as “killing the pulp”, and it’s not enough to just kill it, but to clean it up thoroughly and fill the root canal tightly to prevent the inflammation from recurring. Regular dental checkups for the elderly are necessary to solve problems early and not to delay the problem, which will not only cause pain and suffering, but also make the treatment more difficult and affect the effectiveness of the treatment. Periodontal disease is an important cause of missing teeth in the elderly. The main manifestations are, loose teeth, periodontal redness, swelling and pus overflow, biting weakness, oral odor and so on. Since periodontitis does not cause severe pain in the early stages like caries, it is often overlooked. This, on the contrary, becomes an important reason why periodontal disease is so harmful. Early periodontal disease is not effectively treated and professional health care guidance, when the development of the middle and late stage, the doctor treatment is much more difficult. In many cases, the only option is to remove the affected tooth, which is something neither the doctor nor the patient wants. Effective periodontal treatment involves a comprehensive periodontal examination, the development of a systematic treatment plan, and finally, routine maintenance. Periodontal diseases are more likely to be considered as a result of habits and lifestyles, they come and go slowly, and thorough prevention and treatment requires the joint efforts of both the patient and the doctor. Older people have more or less restorations in their mouths, namely various types of dentures. Good dentures can replace the missing teeth to play a function, but bad dentures not only have no function, but also may jeopardize oral health, or some seem to work temporarily, but in fact, it is a time bomb, the rest of the teeth and mucous membranes in the oral cavity to cause harm. It is recommended that older people with restorations (dentures) in their mouths should have regular oral checkups to detect problems, repair them in a timely manner, and replace them when necessary. Older people entering their sixties or above can ensure that their dentures can be used for another ten or twenty years after a thorough exchange with a professional doctor, and if not, replace them with dentures that can do the job and minimize the risk of replacing them halfway through the year. This is because as seniors age, their tolerance for oral treatment gradually decreases, their ability to express themselves weakens, and communication with the doctor becomes more difficult, making it difficult for the doctor to effectively meet the patient’s requests. The many trips to and from follow-up appointments can be a great burden for elderly patients. Oral and dental health is closely related to the quality of life of the elderly. Retaining more healthy teeth and making comfortable dentures with good function can effectively improve the quality of life of the elderly and realize the goal of “having a full mouth and a smiling mouth”.