A half hour documentary on fluoride.
Then check out the website www.fluoridealert.org
Fluorine and Bromine and Chlorine along with Iodine are in the family of halogens in the periodic teble of the elements.
These halogens compete for the same spots in your thyroid!
How did they get into your body?
Fluoride does make calcium harder--when it's not in a living organism. Bromine substituted iodine from bakeries in the 60s because "the man" was concerned with too much iodine in the diet. Chlorine is in the water and in swimming pools to fight bacteria.