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| RFK Jr. wants fluoride out of American drinking water. Two U.S. states have already banned it. Should you be worried about what’s coming out of your tap? Today, we look at the research, including a major new study tracking 10,000 people over decades, and the truth is, as usual, more nuanced than those for and against fluoridation want to admit.
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Let’s look into it,
Tim Snaith
Newsletter Editor, Healthline
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Written by Tim Snaith
May 6, 2026 • 3 min read |
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| Your tap water is probably fine
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| Fluoride isn’t something new, it has been added to American drinking water since 1945. Grand Rapids, Michigan was the first city to roll it out and reported a 60% drop in tooth decay among local schoolchildren within a few years. For most of the eight decades since, it’s been a quiet public health win, but recently it’s become politically charged with high profile figures like RFK Jr. pushing to remove it from public water over safety concerns.
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| What isn’t disputed is that fluoride protects your teeth. It strengthens enamel, slows cavity-causing bacteria, and supports bone formation. The dental case for it, built over 80 years, remains solid, like a set of fully fluoridated teeth.
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| The concerns cannot be dismissed out of hand, however. The National Toxicology Program (NTP) has reviewed research suggesting high fluoride exposure may reduce IQ in children. Utah and Florida have already banned it, and several other states may follow.
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| Let’s quickly look at the numbers.
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- The U.S. standard is 0.7 milligrams of fluoride per liter (mg/L), equivalent to about 3 drops in a 55-gallon barrel of water.
- The World Health Organization (WHO) safety limit is 1.5 mg/L.
- The NTP’s IQ findings were based on populations exposed to levels above that threshold — more than double the US standard.
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| Plus, many of those studies didn’t account for other factors that shape cognitive development, like income and local environment.
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| The most recent study, published this year, followed more than 10,000 people from 1957, testing cognitive function at multiple points between ages 53 and 80. There was no difference — at any age — between people who grew up drinking fluoridated water and those who did not. This is the most robust human evidence we have on US exposure levels.
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| However, one question remains around prenatal exposure. A handful of studies suggest the picture may be less clear for developing babies, and this is worth raising with your doctor if you’re pregnant.
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| Overall, at the levels used in the US, the safety record is strong, and the dental benefit is real. The IQ concerns come from higher-dose scenarios and do not stand up at standard American exposure levels. Removing fluoride has consequences, too — tooth decay remains one of the leading reasons children end up in hospital, a cost that rarely makes the headlines.
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