Fluoride is a highly toxic substance that should not be ingested. Consider, for example, the poison warning that the FDA now requires on all fluoride toothpastes sold in the U.S. or the tens of millions of people throughout China and India who now suffer serious crippling bone diseases from drinking water with elevated levels of fluoride.
Germane links:
http://articles.mercola.com/sites/articles/archive/2012/08/07/effects-of...
http://www.livescience.com/37123-fluoridation.html
http://www.globalhealingcenter.com/health-hazards-to-know-about/where-th...
http://www.nyrnaturalnews.com/article/qa-whats-so-bad-about-fluoride/
http://www.cancer.org/cancer/cancercauses/othercarcinogens/athome/water-...