The present study was to investigate the relationship between the caries activity test (Cariostat(R)) at 1 year-6 months of age (caries free) and the caries status at 3 years, 6 years of age in 557 children. Furthermore, to investigate the relationship between the combination of Cariostat score at 1 year-6 months of age and 3 years of age with caries status at 6 years of age. 1) The Cariostat score at 1 year-6 months of age correlated significantly with the mean df-tooth at age of 3 and 6 years

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... of age (p<0.001). 2) When the Cariostat score was divided into three groups (low risk/middle risk/high risk) at 1 year-6 months of age, the distribution of caries prevalence and the mean df-teeth at 3 years of age showed a significant difference among the three groups (Chi-square test, ANOVA p<0.01). 3) When 1 year-6 months and 3 years of age the Cariostat score were combined, the low-low risk group showed the lowest mean df-tooth at aged 6 years of age. On the other hand, the high-high risk group showed highest mean df-tooth at 6 years of age. It is suggested that when at 1 year-6 months and 3 years of age the Cariostat scores were combined, a higher correlation was shown with the carious status at 6 years of age.