The collective dental examinations of nursery school children aged 3 to 5 in Shinshinotsu village in Hokkaido have been conducted for several years by our departments in cooperation with the administrative organs of Shinshinotsu village. The data of dental examinations in 1994 were analyzed and compared with the data for 1988 as well as with the data of the Survey of Dental Diseases by the Health Policy Bureau Ministry of Health and Welfare, Japan in 1993 and 1987. The results were as follows; (1) The rate of persons with carious teeth and the mean number of carious teeth per person in Shinshinotsu village were higher than those of the National Survey by the Ministry of Health and Welfare at all ages. (2) The rate of persons with carious teeth and the mean number of carious teeth per person decreased. The rate of persons with dental treatment increased from 1988 to 1994 in 4 year-old children in Shinshinotsu village in the same manner as the results of the National Survey by the Ministry of Health and Welfare, while dental caries showed no decrease in the 3 and 5 year-old children.