Rob:
>Long-term exposure to levels of fluorides in excess
>of 200 micrograms per kilogram of body weight per day
> — levels that are much higher than those to which the
>average Canadian is exposed on a daily basis, including
>exposure from fluoridated drinking water — may be associated
>with skeletal fluorosis.

There is a lot of dispute about the levels you cite.
<www.fluoridealert.org> and <www.nofluoride.com>
are good places to start. The leading expert on
fluoride in Canada Dr. Hardy Limeback, PhD,
dentistry professor at the University of Toronto
is now speaking out against fluoridation.  The article at
<http://www.ottawacitizen.com/national/010117/5013331.html>
chronicles the shift that has started in Canada on the
issue of fluoridation.

Peter