Where It Comes From
Natural groundwater, community water fluoridation, toothpaste/mouth rinses, tea and some foods, and emissions from aluminum and phosphate fertilizer industries [1][4].
How You Are Exposed
Drinking water (main source), swallowing dental products, food/tea, and workplace air in certain industries [1][4].
Why It Matters
High levels cause dental fluorosis; very high, long-term intake can cause skeletal fluorosis [1][3]. EPA’s drinking-water limit is 4.0 mg/L (with a 2.0 mg/L secondary standard for cosmetic effects) [2]. NTP finds fluoride is presumed to be a developmental neurotoxicant at elevated exposures [5].
Who Is at Risk
Young children, infants fed formula mixed with fluoridated water, people with kidney disease, private well users in high‑fluoride areas, certain industrial workers, heavy tea drinkers [1][3][4].
How to Lower Your Exposure
Check your water’s fluoride (utility Consumer Confidence Report or test private wells) [2]. If high, consider reverse osmosis or activated alumina treatment [3]. Use a pea‑sized dab of toothpaste, supervise children, don’t swallow, and consider low‑fluoride water for infant formula [4][1].
References
- [1]ATSDR. Toxicological Profile for Fluorides, Hydrogen Fluoride, and Fluorine. Agency for Toxic Substances and Disease Registry, 2003.
- [2]EPA. National Primary Drinking Water Regulations: Fluoride (MCL 4.0 mg/L; SMCL 2.0 mg/L). U.S. Environmental Protection Agency.
- [3]WHO. Guidelines for Drinking-water Quality, 4th ed. incorporating the 1st addendum. World Health Organization, 2017. Guideline value: 1.5 mg/L.
- [4]CDC. Community Water Fluoridation; Using Fluoride Toothpaste. Centers for Disease Control and Prevention.
- [5]NTP. Monograph on the Systematic Review of Fluoride Exposure and Neurodevelopmental and Cognitive Health Effects. National Toxicology Program, 2020.