Fluoride is not "in fact toxic". A substance becomes toxic in high amounts. Vitamin D becomes toxic in high amounts. The level of fluoride in drinking water is well below the toxic level.
I really don't agree with that Paracelsian view. Some substances are Paracelsian, other are like lead, and I'd place fluorides in-between these two, a neither fully Paracelsian or non-Paracelsian poison.
I can't believe so many people would downvote a peer-reviewed paper just because it doesn't sit well with their politics, it really shows how cult-like science discourse in the US has become.
