发展中国家儿童的龋患率首次超过发达国家。世界卫生组织口腔资料库1982年12岁儿童恒牙龋补缺牙数,发展中国家是4.1,发达国家是3.3。二十年前大多数发展中国家是1以下,发达国家是10以上。1850年以前,西方国家的龋齿很少,以后快 For the first time, the prevalence of caries in developing countries surpassed that of developed countries. World Health Organization Oral Database The number of permanent dental caries in 12-year-olds in 1982 was 4.1 in developing countries and 3.3 in developed countries. Twenty years ago, most developing countries were below 1 while those in developed countries were above 10. Before 1850, there were very few dental caries in the West and fast afterwards