Nahhh... doesn't effect the brain at all...
Fluoride & the Pineal Gland: Study Published in Caries Research

Luke hypothesizes that one of the four enzymes needed to convert the amino acid tryptophan (from the diet) into melatonin is being inhibited by fluoride. It could be one of the two enzymes which convert tryptophan to serotonin or one of the two which convert serotonin to melatonin.

Significance? Huge. Melatonin is reponsible for regulating all kinds of activities and there is a vast amount of work investigating its possible roles in aging, cancer and many other life processes. The one activity that Luke is particularly interested in is the onset of puberty. The highest levels of melatonin ( produced only at night) is generated in young children. It is thought that it is the fall of these melatonin levels which acts like a biological clock and triggers the onset of puberty. In her gerbil study she found that the high fluoride treated animals were reaching puberty earlier than the low fluoride ones.

We know from recent studies - and considerable press coverage - that young girls are reaching puberty earlier and earlier in the US.

I'm not going to waste my time arguing with you. I merely wanted to give one example where your statements reflect the lies of the conventional medical establishment, not reality.

I also know that you would willingly consume poison, and advise others to, before you would ever sacrifice being "right", or make your authorities look "wrong".

Anyone who is genuinely interested in their health can go on Google and search for information on fluoride as well as aspartame. Read about it in a variety of contexts and form your own working conclusions. As soon as you get out of the corporate-funded studies, the news about fluoride is anything but good.
study fluoride pineal - Google Search

Meanwhile, Big Dave - keep drinking your fluoride in large quantities. No bottled water for you. Take your own advice. Put your mouth where your money is.