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In 1970 a weekly fluoride mouthrinsing program using 0.2% neutral NaF solution was initiated in the elementary schools of Yahiko District, Niigata Prefecture, Japan (F<0.1 ppm in drinking water). The same program was started at the juniour high school in 1973 and a daily fluoride mouthrinsing program was started in 1978 at all four nurseries in the district. Therefore at present, such programs start at the nursery school level and continue to the 3rd grade in the junior high school within an individual school system. We investigated the benefits to the permanent teeth from this 17-year school-based fluoride mouthrinsing program. This report presents the effects of ongoing supervised fluoride mouth rinsing program on caries prevalence of permanent teeth according to the age of starting the fluoride mouthrinsing program. A baseline examination for schoolchildren in 1st-6th grades was conducted in 1970, before the mouthrinsing program began. An examination conducted in 1978 presents the data of children who participated in the program since their entrance into the elementary school, that is, at the age of 6. An examination conducted in 1987 presents the data of children who participated in the program since the age of 4 in the nursery schools. The DMF person rate in all grades decreased from 72.8% in 1970 to 41.6% in 1978 and 27.6% in 1987. The DMFT-index in all grades decreased from 2.27 in 1970 to 1.39 in 1978 and to 0.48 in 1987. 116 *福 岡歯科大学 口腔 衛生学教室(境 脩教授) *Department of Preventive Dentistry Fukuoka Dental College (Prof . Osamu SAKAI) **新 潟大学歯学部予防歯科学教室(主 任:堀 井欣一教授) **Department of Preventive Dentistry , Niigata University School of Dentistry (Director: Prof. Kin-ichi HORII)

The results of a 17-year fluoride mouthrinsing program for Japanese schoolchildren in a community.