I have studied this topic for a long time and have a lot of useful media to share on it. Check out my post here if you like, it contains a less well known, but great documentary with many professional speakers in it - plus I also shared a way to make homemade mineral water pretty cheaply: Check out this insightful documentary about fluoridation if you doubt that fluoride is poisoning us: https://steemit.com/science/@ura-soul/an-inconvenient-tooth-documentary-or-professors-scientists-dentists-and-water-professionals-expose-the-ugly-truth-about-water