I heard fluoride kills some species. why do we still have it in our water?

Safe in small amount: Many communities add a small amount of fluroide to the water system to remineralize soft areas on the teeth to stop cavities from forming. Too much Fluoride can cause flurorsis-a white or dark chalky appearance of the teeth. Fluoride is a natural substance in the earth, water and air and used in small amounts is harmless. For more info: http://www.Cdc.Gov/fluoridation/safety/dental_fluorosis.Htm.

Less cavites: Flouride in the amount of .8 to 1.0 parts per million in our water has been shown to reduce the amount of cavities in adults and children in study after study that has been peer reviewed. Just like aspirn, in concentrated form , flouride can be toxic.

Benefit v risk: Fluoride, in therapeutic amounts, does wonders at helping keep teeth healthy. Your Dentist will help titrate the appropriate amount for you. If you lived in a Denver, for example, naturally occurring Fl concentration has to be reduced. In a Philadelphia, it has to be added. As to species susceptibility, you couldn't live next to undersea sulfur volcano vents, yet tube worms thrive.