Here's one such (meta) study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491930/#!po=58.3333 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491930/#!po=58...

Here's one such (meta) study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491930/#!po=58.3333 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491930/#!po=58... Note that it focuses on child development and several of the included studies have populations which rely on water sources contaminated way beyond typical fluorodation (up to 10mg/l vs 1mg/l). Also we're talking about a small difference in IQ (-0.5 point, still very costly in personal and societal terms); nothing about making populations docile.