PURPOSE: To analyse possible changes in the severity and distribution of dental caries within the dentition in five groups of 4-year-old children examined with the same methods and criteria between 1980 and 2002. MATERIALS AND METHODS: The material consisted of retrospective caries recordings from cross-sectional studies performed in 1980, 1987, 1992, 1997 and 2002 in Umeå, Sweden. The distribution of dmfs within the dentition was analysed in the whole groups and in one third of each group with the highest dmfs-values (mSiC-index). RESULTS: When comparing the whole groups, no statistically significant changes were found over the years concerning total dmfs, or dmfs in molars and canines or in occlusal surfaces (p > 0.05). There was a significant increase in dmfs-values in incisors observed between 1980 and 1987, while a similar reduction was observed between 1987 and 1992 (p 0.05). There was, however, a statistically significant increase in the dmfs-values for molars and canines between 1997 and 2002 (p