Fluoride? Way the heck back around 1970 when it first got fashionable to fluoridate city drinking water it was already known that dosage was critical. Too much, by just a bit, would dissolve everyone’s teeth. Metering is/was critical. That was the explanation is used to keep it out of my own town’s system. If the stuff can dissolve your teeth why wouldn’t it also be dissolving your brain at the same time??? The IFTYS girl has it right-—