In humans, only five substances have so far been documented as developmental neurotoxicants: head, methylmercury, polychlorinated biphenyls, arsenic, and toluene. From this evidence, including our own studies on some of these substances, parallels may be drawn that suggest that fluoride could well belong to the same class of toxicants, but uncertainties remain. At smallest 200 industrial chemical are known to cause brain toxicity in humans, chiefly adults, and they must also be suspected to harm the developing brain. Because of the individual and societal importance of optimal brain function, recognition of developmental neurotoxicity is a public robustness priority, and further evidence on fluoride is needed.
Answers:    Well, according to your study, uncertainties remain. I've never heard of this myself.

Fluoride is in almost everyone's drinking water surrounded by the USA, and it's in almost every toothpaste that exists. If a positive correlation is shown between it and any serious health problem, it will be major communication.

In other words, if no one has ever heard of this, I doubt that it's something to verbs about right now. If if it poisonous, well, it's too behind schedule for you and me ;)

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Sharp chest headache and side cramp!!?

There seems to be divided opinion on this but some experts claim that fluoride is a real form hazard and that we are better off without it.

You can find further information surrounded by a web search for fluoride + "health hazards".

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Question more or less foot cramps, please..