20 Aug 2019 --- Fluoride exposure during pregnancy is associated with lower IQ scores in children aged 3 to 4 years in a prospective birth cohort study published in JAMA Pediatrics, a medical journal of the American Medical Association. This study examined whether exposure to fluoride during pregnancy was associated with IQ scores in children in a Canadian birth cohort in which 40 percent of the sample was supplied with fluoridated municipal water. Experts in the field, however, have spoken out against the findings of the study, calling for discretion when reviewing its results.