The study, published Tuesday in the journal Environmental Health Perspectives, evaluated nearly 300 sets of mothers and children in Mexico and tested the children twice for cognitive development over the course of 12 years. However, although the researchers found a potential connection to a child’s exposure to fluoride in utero, they found no significant influence from fluoride exposure on brain development once a child was born.
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NOTE: About 75% of Americans are exposed to fluoride through public water, but Mexico does not have a fluoridation program.