"Caries", commonly known as a "decay", is a high incidence of human disease. In China for the third time in 2005 oral health survey shows: every 100 children 5 years of age in more than 66 people mouth dental caries, 35-44 years old middle-aged population, the proportion of up to 88.1%, and 65 ~ 74 years old of the caries rate is as high as 98.4%.

      WHO has been the three major disease prevention and treatment of dental caries and cancer, cardiovascular disease. And after two kinds of diseases, dental caries also has a good effect of prevention, early treatment of pain is small, little damage, less expensive characteristics.

      Dental caries is the foods containing sugar (sucrose) into the mouth, in dental plaque by cariogenic bacteria induced, acidogenic fermentation, these acids (mainly lactic acid) from pressure surface of the weak structure of the local invasion, dissolution of the destruction of the teeth of the inorganic.

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