Specifically talking about municipal tap water
In: 2
Not much.
If you boil off the water entirely, you’ll get a little bit of fluoride in the resulting minerals (which, in most places, will be deposits of various soluble minerals like calcium carbonate). But there’s really not very much fluoride in fluoridated water – about a milligram per liter, or about 1 part per million by weight. So even boiling off an entire pot of water will only result in a few (EDIT: milli-)grams of fluoride minerals.
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