Fluoridation being some sort of "Natural Process", whatever that is deemed to mean, is an antifluoridationist concoction, not anything that fluoridation proponents have put forth. 
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The facts are: 
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1. Humans have ingested fluoride in their water since the beginning of time.
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2.  In the entire 71 year history of fluoridation, there have been no proven adverse effects, in spite of this having been  the most tested and retested public health initiative in history.
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3.  Only enough fluoride ions are added through fluoridation which will bring the existing fluoride level in a water supply up to 0.7 ppm.
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4.  Fluorosilic acid is simply a vehicle which delivers additional fluoride ions into water. The fluoride ions added are identical to those already existing in that water. Once those ions are released, FSA no longer exists in that water.  It does not reach the tap. It is not ingested

5. FSA is a substance produced for specific uses, fluoridation being but one
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Steven D. Slott, DDS