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And how does the fluoride get in the water? Our water tastes strongly of chlorine because we are near the treatment plant and they put in enough so that it’s still effective at the edges of the system. I don’t know if fluoride works the same way, but what makes people think it’s always added at exactly the right levels?

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The chlorine you are tasting in your water is an active, reacting compound. It has to be because it literally reacts with cells to kill them and keep the water (relatively) free from living organisms. It's great as a cheap way to keep living things out of the water but at the end of the pipe it should be removed - a simple Brita filter is fine.

Flouride added is in a chemical state that makes it stable, like the chlorine in table salt. It will stay at the same concentration as it travels in the pipe.

I remember this from a water chemistry course at university.

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