According to the U.S. “Daily Science” website reports, in addition to the “sunrise, sunset and rest” rhythm of life, there is another rhythm of life in living organisms. It is reported that the scientists called “growth rhythm” of the biological clock phenomenon is also related to the length of life and body size. New York University Professor of Dentistry Timothy Bromwich. Professor Bromwich announced his findings at the 37th Annual National Conference on Dental Research. He said that bone growth and tooth growth are controlled by the same biological rhythm that also affects bone and body size and many metabolic processes, including heart rate and respiratory rhythm. In fact, the rhythm influences the entire activity pattern of the organism as well as the life cycle, so that rats grow their teeth and bones eight times faster than humans, and therefore die earlier. This newly discovered rhythm, like the daily rhythm, is determined by the inferior optic thalamus, an area that is the control center of the self-regulating nervous system. However, unlike the daily rhythm, this rhythm varies with the individual organism, with shorter intervals for smaller mammals and longer intervals for larger ones. For example, the growth rhythm interval is 1 day for rats, 6 days for gorillas, and 8 days for humans. Bromwich discovered this periodic pattern when he observed the growth line of tooth enamel, which resembles the annual rings of trees, and the related type of skeletal tissue growth, which was the first time this growth pattern was observed in the skeleton. In addition, humans are by far the species with the most variable “growth rhythm” found, ranging from 5 to 10 days. Correspondingly, humans are also the mammal with the greatest variability in body size. Professor Bromwich said that because the self-regulating nervous system controls human behavior, he will further investigate whether growth rhythms are related to human behavioral diversity. How is dental health related to longevity? Oral health is a mirror of human health and is an important component of whole-body health. Oral health makes people chew well and enjoy delicious food; oral health makes people speak clearly and express themselves; oral health makes people feel more confident and express themselves in the social arena; oral health also prevents and reduces “focal infections” and reduces the occurrence of diabetes, coronary heart disease, stomach disease, low birth weight and other diseases. Occurrence. The standard of a healthy mouth is clean teeth, white color, no tooth decay, healthy gums, and fresh breath. However, according to the oral health epidemiological survey, the state of unhealthy oral cavity is still quite serious in China, and the number of cavities per capita is more than two, that is to say, there are about 2.5 billion decayed teeth in total for all Chinese people. A survey also shows that in several coastal cities such as Guangzhou, Beijing and Shanghai, where life is richer, one out of every five people suffers from tooth decay on average. In the past, folklore says “toothache is not a disease”, but modern medicine proves that oral diseases can cause diseases in other parts of the body, such as dental caries can cause pulpitis and periapical infection, and as a focal point to cause jaw and face infection, endocarditis, rheumatoid arthritis. Periodontal disease can also have an impact on the general health. The pathogenic bacteria of periodontitis can enter the bloodstream and cause bacteremia, and the toxins or metabolites of the bacteria can spread, causing an immune response and affecting systemic health. More commonly, it causes rheumatic heart disease or acute or subacute endocarditis. Statistics show that the ratio of death or hospital admission due to coronary heart disease is 25% higher in patients with periodontitis than in non-periodontitis individuals; the risk of preterm and low birth weight babies in pregnant women with severe periodontitis is 7.5 times higher than in normal pregnant women; the causative bacteria of periodontitis cause difficulties in metabolic control in diabetic patients than in non-periodontitis patients. Modern people seek to live a rich and healthy life and be happy for the rest of their lives, but it is difficult for people with bad teeth to live a long life. The reasoning is easy to understand: bad teeth, shedding and missing, will directly affect the chewing function. Nutrition can not enter, and talk about what longevity? The latest research also found that the loss of teeth due to oral chewing movement, will reduce the stimulation of brain cells, over time will affect the vitality of brain cells, making memory loss, so that the incidence of Alzheimer’s disease increased. In addition, the role of teeth in language, beauty, instrumentation and especially psychological aspects is also incalculable. This is because in social activities, teeth are the second business card of a person. Missing teeth and diseases affect not only one’s physical health but also one’s psychological health, for example, when one loses one’s canine teeth, the cheeks partially collapse as a result, making one look particularly old-looking. Therefore, the process of paying attention to oral health is the process of improving the health of the whole body, prolonging life and improving the quality of life.