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Purpose: to evaluate the prescription of prenatal fluoride supplements by gynecologists and obstetricians in Curitiba and metropolitan region. Methods: two hundred and twenty-three (223) questionnaires were distributed to gynecologist-obstetricians. Questions were about the use of fluoride during pregnancy, time since graduation, workplace, among other parameters. Statistical analyses were carried out using Student's t-test, variance analysis (ANOVA), chi² test or Fisher exact test. Results: only 137 questionnaires were returned, which corresponds to 30% (137/441) of the professionals in the studied area and 61.4% (137/223) of the distributed questionnaires. Of the professionals, 47.5% prescribe fluoride as a supplement during pregnancy. Sixty percent of professionals who prescribe fluoride believe that this procedure leads to a better dental formation and caries prevention in the baby. The professionals who do not prescribe prenatal fluoride graduated more recently than the professionals who prescribe it (t=2.27, p<0.05). Moreover, the professionals who work exclusively in the public service prescribe less than those who work only in the private sector (Fisher exact test, p<0.05). Conclusion: there is a large percentage of gynecologist-obstetricians who still prescribe fluoride in the prenatal period, in spite of the recent studies that have not observed any benefit to the child. Therefore, there is a need to update these professionals about the mechanism of action, indication and clinical use of fluoride.