Don writes:

<<So, in all, it seems clear to me that fluoride, specifically sodium
fluoride, is about as "natural" as you can get, and it is highly unlikely
that 1 part per million in your drinking water, or that consuming fluoride
from tea leaves or fish, or any other food source, is toxic.>>

Which was exactly my point originally.  Fluoride toothpastes, fluoride
treatments are a  bit of overkill (honestly, I'd prefer to avoid it in water
also).

Siobhan