 found no evidence that fluoride in drinking water lowers IQ, adding to growing research supporting the safety of community water fluoridation.){kind=link}
A major 2026 study published in the Proceedings of the National Academy of Sciences (PNAS) found no evidence that fluoride in drinking water lowers IQ, adding to growing research supporting the safety of community water fluoridation.
Long-Term Research Across Decades
Researchers from the University of Minnesota, University of Wisconsin, and University of Michigan analyzed data from more than 10,000 individuals in Wisconsin. The study tracked participants from childhood through late adulthood, comparing those exposed to fluoridated water with those who were not.
The results showed no difference in IQ or cognitive performance between the two groups, even after decades of follow-up.
Reinforcing Previous Findings
The study aligns with earlier U.S.-based research, including a 2025 report in Science Advances, which also found no connection between fluoride exposure and reduced cognitive ability. Researchers emphasized that their findings are based on fluoride levels commonly used in U.S. public water systems, making them highly relevant to policy decisions.
Public Health Benefits of Fluoride
Fluoride is a naturally occurring mineral found in water sources and is widely recognized for its dental benefits. According to the American Dental Association and the Centers for Disease Control and Prevention, fluoride helps prevent cavities, strengthens enamel, and repairs early tooth damage.
The CDC has even named water fluoridation one of the top 10 public health achievements of the 20th century. Studies show it can reduce tooth decay by at least 25% in both children and adults.
Ongoing Debate and Policy Impact
Despite scientific consensus, fluoride remains a topic of political debate. Some states, including Florida and Utah, have recently moved to restrict or ban fluoridation. Critics argue it may pose health risks, though many studies cited involve fluoride levels significantly higher than those used in the U.S.
Researchers note some limitations, including estimating fluoride exposure based on residence rather than direct biological measurements. Still, experts say the overall evidence strongly supports fluoridation as a safe, effective public health measure.
Bottom Line
The latest research provides strong reassurance: fluoridated drinking water does not harm cognitive development and continues to offer significant dental health benefits.
For more health recommendations and guidelines, stay tuned to Que Onda Magazine.