A massive 40-year study in the US has concluded that adding fluoride to drinking water does not reduce people's cognitive ability. In fact, kids who grew up with fluoridated tap water performed slightly better in mathematics and reading in later life compared to those who didn’t. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Scientists at the University of Minnesota looked at data from reading comprehension, mathematics, and vocabulary tests given to around 26,820 people in over 1,000 American high schools between 1980 and 2021. This was paired with information about the fluoride levels they would've experienced since conception, plus other data about their wider health, socioeconomic background, environment, and other factors.

The

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