本文报告 Watford 等3个地区氟化水源研究的方法和结果。每个研究区和它的对照区有可以比较的条件。它们水源的含氟量极微。在研究区水厂的水中加氟化物使氟的浓度达到百万分之一。在所有区进行了口腔检查。由经过专门训练的口腔科人员负责,以保证在整个研究过程中保持相同的检查标准。记录了每个龋洞及充填物的位置和范围,以及龋洞的深度;也 This paper reports on the methods and results of the research on the fluoride source in Watford and other three regions. Each study area and its control area have comparable conditions. Their sources of fluorine content is minimal. Adding fluoride to the water in the waterworks of the study area brought the concentration of fluorine to one part per million. Oral examination was performed in all districts. It is the responsibility of specially trained dentists to ensure that the same test standards are maintained throughout the study. Record the location and extent of each cavity and filling, as well as the depth of the cavity;