this post was submitted on 27 Sep 2025
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[–] Tenderizer@aussie.zone 1 points 2 days ago* (last edited 2 days ago)

https://jamanetwork.com/journals/jamapediatrics/fullarticle/2828425

It says fluoride levels of 2-4mg/L are correlated in a reduction of IQ. But technically the WHO has long since recommended a maximum of 1.5mg/L due to a risk of fluorosis which is a comparatively minor concern, though it’s hard to find information about what levels are considered safe beyond “recommendations”. Either way many places have higher than 2mg/L of fluoride in the tap water (due to natural content).