M.S.
I would suggest spending the money to have your well water tested before doing drops. Many well waters have flouride naturally. it's a fairly narrow range of flouride concentration that's needed/wanted. Too little and teeth suffer. Too much and teeth become mottled. Way too much and bones and teeth can become brittle. Also, if you're in the mountains, I'd also strongly recommend testing your well water for radionuclides - they're very prevalent in the foothills of Denver. The tests that are done when the house are sold are only for bacteriological contamination - that which will make you sick right away. Radionuclides and other tests are not required by law and are seldom done unless a homeowner is savvy enough to ask for them.