WHO把龋齿列为在世界内应重点防治的三大慢性非传染性疾病之一,排在心脑血管病和癌症之后的第三位。据调查,我国60～70％的人患有不同程度的牙病,其中龋齿和牙周病为常见病、多发病。60岁以上老人人均7颗龋齿,学龄前儿童更为严重,患龋率达80～90％,人均5～6颗龋齿。健康的生活需要口腔卫生。全国范围的口腔卫生保健工作 WHO lists dental caries as one of the three major chronic noncommunicable diseases that should be focused on prevention and control in the world, ranking the third after cardiovascular and cerebrovascular diseases. According to the survey, 60-70% of our country people have different degrees of dental diseases, of which dental caries and periodontal diseases are common diseases and frequently-occurring diseases. Per capita caries are more than 60 years old, and the preschool children are more serious. The caries prevalence is 80-90%, and the average number of caries is 5-6. Healthy life requires oral hygiene. A nationwide oral health care effort