BusyBodyHealth

Flouride on your teeth prevents tooth decay, but DO NOT ingest it. It is a toxic industrial waste product, which may also be contaminated with lead, arsenic, radionucleotides, aluminum and other undustrial contaminants. The flouride added to your municipal water supplies is not pharmaceutical grade. Read the full article here. 

25 studies prove that it reduces your IQ, even in moderate amount. Read the full article here.
In addition, it has been established that flouride has the ability to alter your endocrine function involving your thyroid, parathyroid, and pineal glands, as well as your adrenals, pancreas, and pituitary. Read the full article here. 

Flouride in your pineal gland may cause cancer. Read the full article here.

Sources & References:

http://articles.mercola.com/sites/articles/archive/2011/12/03/paul-connett-fluoride.aspx
 http://articles.mercola.com/sites/articles/archive/2011/08/09/fluoride-and-pineal-gland.aspx