The three year preventive intervention focused to the improvement of oral health preventive knowledge, behaviour and to the increase of intake of fluoridated salt and of other natural fluoride sources was conducted in the district of Frýdek-Místek in the North Moravian county of the Czech Republic. The intervention was composed of regular district-wide information spread by local journals, broadcast and TV and by lectures among school-children, their parents, pediatricians and dentists.Oral health status and urine fluoride content together with knowledge in fluoride prevention and eating habits related to fluoride intake were recorded in school-children in the onset (1997) and by the end (1999) of the intervention and data gained were compared. Altogether 240 6th to 8th graders of elementary schools in the district town and in three rural localities were included in the study.Oral health: Caries experience decreased in three of four examined localities, in the city of Frýdek-Místek (meanDMFT2.92 vs. 1.90),Třinec (mean DMFT 2.73 vs. 1.94) significantly and in Jablunkov (4.10 vs. 3.75) non-significantly. In the remaining rural locality, Vratimov, the DMFT non-significantly increased (1.19 vs. 2.31). The three-years oral health and fluoride intake promoting intervention in the district of Frýdek-Místek improved significantly oral health and caries preventive knowledge in schoolchildren aged 12 to 14 years.

        Key words: fluoride – intervention study – oral health – school-children