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).
We shouldn't have local council elections, none of us know who TF these people are. Or we should have mandatory party affiliations in local council elections.