Oral diseases cause premature loss of chewing function in many middle-aged and older adults, and may also cause or aggravate heart disease, stomach disease, diabetes, cardiovascular disease, and joint disease. How to check for premature loss of chewing function? Oral diseases in middle-aged and older adults impair the function of the oral masticatory system. Looking around us, even among middle-aged and elderly people in their 50s and 60s, many of them have long had less than 20 functional teeth, that is, they are not very old and have lost all their teeth. Periodontitis often manifests itself as bleeding gums, bad breath, overflowing pus, loose teeth in severe cases, weakness of bite and persistent dull pain. I. Clinical manifestations Oral diseases in middle-aged and elderly people damage the function of oral chewing system. At present, oral diseases of middle-aged and old people are mainly reflected in three major aspects: caries, periodontal disease and tooth defect and wear. 1.Caries: middle-aged and elderly people have more rotten teeth, especially root surface caries. Root surface caries is often not easy to find because of the hidden location, once found, it is more serious, and many of them will cause tooth nerve pain. Periodontal disease: The early symptoms of periodontal disease are not easy to attract attention, resulting in long-term chronic infection of periodontal tissues and recurrent inflammation, and the condition is quite serious when patients visit the clinic, which not only damages the function of oral chewing system, but also seriously affects the whole body health. 3, dental defects and wear: middle-aged and elderly teeth after decades of use, some will be due to bad habits such as long-term use of hard-bristled large-headed toothbrush horizontal brush or love to bite hard objects or eat acidic food, resulting in dental defects such as occlusal surface wear, so that the teeth chewing function is reduced, such as not taking effective protective measures, will make the loss of functional teeth faster and more. Second, laboratory examination 1, oral examination including dental examination, gum examination, oral mucosa examination, etc.. Early detection of lesions and timely treatment can be achieved. 2.X-ray examination can exclude dental pulp lesions, apical tissue lesions, and dental films are also valuable for diagnosing periodontal inflammatory lesions.