人们都知道龋病和牙周病是口腔医学领域里的重要疾病,它们是危害人类口腔健康最严重和最多发的疾病,人类对这两种疾病进行了很长期的斗争。在现代人类中,龋病的危害是相当严重的。在工业发达的资本主义国家,人们的患龋率可达90%以上,据记载十九世纪欧洲人的患龋率即已高达93～97%。日本人民的 People know that caries and periodontal disease are important diseases in the field of stomatology. They are the most serious and the most inflamed diseases endangering human oral health. Humans have a long fight against these two diseases. In modern humans, the harm of dental caries is quite serious. In industrialized capitalist countries, the prevalence of caries is more than 90%, and it is well documented that the caries prevalence of Europeans in the 19th century was as high as 93-97%. Japanese people's