[R.B.]

And this paper http://www.google.com/url?sa=t&rct=j...55123115,d.Yms powerfully makes the point that water flouride levels of 1.4 and 1.6 mg/l can result in significant levels of fluorosis 62.96% and 76.49% respectively - they also noted the water was low in zinc and selenium - so maybe there is a cautionary tale here;

The determination of a safe fluoride intake should have regard to wider mineral intake

High fluoride levels may ? reduce mineral availability, which is particularly relevant in those who are already mineral deficient.


Given many in the west are mineral deficient in one or more minerals this may be of particular significance.