I not really sure but it messes with your stomach i think and you can die if you have to much. Saw it on csi!
Probably because it was first recognized in fluorspar or fluorite (which is calcium fluoride).
Fluoride(s) may be found in toothpaste and is even added in trace quantities to drinking water in certain parts of the world. Fluorine is extremely reactive and not found in nature. It may be found...
buy some toothpaste
deficiency means what happens when you lack somethingLacking of something necessary e.g There diet is deficient in vitamins