[Dental fluorosis in schoolchildren in a county in the mountainous region of Rio Grande do Sul State, Brazil].

The aim of the present study was to determine the prevalence and severity of dental fluorosis in all schoolchildren (ages 4 to 18 years, n = 259) from the town of Santa Tereza, Rio Grande do Sul, Brazil, and to investigate associated factors. Data were obtained through a questionnaire and by means of clinical tests. Dean's index was used to determine fluorosis occurrence. Prevalence of fluorosis was 63.7%. The predominant category was very mild (43.6%), followed by mild (12.0%), moderate (7.7%), borderline (7.3%), and severe (0.4%). Approximately 85.0% of the schoolchildren currently have, or have had, access to other topical sources of fluoride. Significant associations were found between place of residence and previous or ongoing fluoride mouth rinsing and prevalence and severity of fluorosis (p < 0.05). There was also a significant association between dental fluorosis and parents' level of schooling, frequency of brushing teeth, fluoride rinsing, and use of fluoride gel (p < 0.05).