A new study published in the Proceedings of the National Academy of Sciences reveals that optimal levels of fluoride in drinking water have no impact on IQ or brain function from childhood through age 80.
Researchers from the University of Minnesota tracked over 10,000 people from the Wisconsin Longitudinal Study (high school class of 1957). They compared cognition and IQ results across decades for those raised with community water fluoridation versus those without and found zero difference. “There is no association with community water fluoridation and any measure of IQ or neurodevelopment,” experts noted.
The Alberta Dental Association endorses community water fluoridation as a safe, effective, and equitable way to prevent tooth decay. Backed by Health Canada, the Canadian Dental Association, Alberta Health Services, the CDC, and WHO, decades of evidence show it reduces cavities with no adverse health effects at optimal levels (0.7 mg/L). The only common side effect at higher levels is mild dental fluorosis, usually harmless white spots on teeth.
Why it matters in Alberta?
Tooth decay is one of the most common childhood diseases. Water fluoridation is proven to cut cavities cost-effectively; every $1 invested can save over $70 in treatment. Alberta saw this clearly when Calgary’s pause in fluoridation led to increased decay in kids; we celebrated its return in 2025.
The science confirms that for best protection:
- Brush twice daily with fluoride toothpaste
- Floss daily
- Limit sugary snacks/drinks
- Visit your dentist regularly
Find out more about the benefits of community water fluoridation
Talk to your dental professional if you have questions. Need a dentist? Find one near you.
Thumbnail photo: A Girl Drinking Water – Getty Images File