Decayed-tooth

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Decayed-tooth infected from mother and others !! Report 1. On 1974, W.H.O researched hiltribe-peoples living in Karakoram Mountains about the actual-situation of 108 people. As a result, they research-team proved that the number of people having a decayed-tooth is very few. The rate of experienced people with a decayed-tooth in Japan was 94.3% in the population. But, Hiltribe-peoples living in Karakoram Mountains, its rate was 23.1% in all. And, The research team investigated about the number of a decayed-tooth and an experienced decayed-tooth in the past. Its average number was 7 teeth. But, Hiltribe-peoples living in Karakoram Mountains, its average number was 0.5 teeth only ! Surprisingly, there was not a dentist in its village. Moreover, they have not a habit to brush a tooth.
Report 2. One man living in Yokohama, Japan. He aparently has not experienced a decayed-tooth since he was born. Usually, he brushes his tooth after a breakfast once a day. Its time is 19 seconds only. too short-time !! He don't brush his tooth after dinner and before going to bed. The research-team examined his teeth about "Streptococcus-mutans".then, Streptococcus-mutans was not detected in his mouth. As a result of research, the number of people who has not experienced a decayed-tooth in the past; is 3% in all. Dental plaque Dental-Plaque is constituted with water<80%> and organic-compound<20%>. Its organic-compound is constituted with bacteria and its metabolic-substances. Calcified-tartar pasted up to a tooth is called "Calculus". More than 100,000,000,000-bacteria contains in a dental-plaque 1g.

Streptococcus-salivarius Streptococcus-mitis Streptococcus-sanguinis Streptococcus-mitior Streptococcus-mutans Porphyromonas-gingivalis Bacterionema-matruchotii Propionbacterium-acnes These bacteria is not exist in a mouth after just birth। Apparently,.....A decayed-tooth is a kind of an infectious-disease. Most people infects mouth-bacteria from mother, father and others until become 3 years old. The case infected from mother's saliva through a feeding-milk bottle is the most plenty of case. With using a spoon after holding a food in mother's mouth, bacteria infects into a baby's mouth ! The period from 1year7months to 2year7months is most highly contagious. If a baby don't be infect bacteria, it is hardly possible to become a decayed-tooth from that time. Because good-bacteria increases on teeth. And, they makes an Oral-Biofilm around each tooth. In Japan, Dentists recommends not to use a milk-bottle for a baby.