Would adding a ground-up calcium-magnesium diet supplement capsule to fluoridated water, neutralize the sodium fluoride, turning it into calcium fluoride? (I would, presumably, add an amount of calcium in mg equal to the mg amount of fluoride in the container of fluoridated water.)

How much volume are we talking about, glasses or gallons? Fluoride is there for a purpose and at very small levels, 1 PPM. In some areas of the country, natural water has more due to fluoride in the rocks where the aquifer is located. What is your concern?

Thanks for your response.

I'm hoping to deflouridate fluoridated water, turning the toxic sodium fluoride into neutral calcium fluoride.

At the level of fluoridation in my municipality (1.5 mg/liter), there is about 300mg of fluoride in a 55 gallon bathtub full of water. That is about the same amount of calcium in a vitamin calcium (with magnesium) dietary supplement tablet.

I have read that about 68% of the fluoride dose we get from fluoridated water is absorbed through our skin when we wash and bathe. If I grind up the calcium tablet and stir it into the bathwater, would this convert the sodium fluoride, readily absorbed through the skin, into the larger calcium fluoride molecule that is not toxic because it is not metabolized by the human body?

If this did work, I might apply the same method to drinking water with a very minute amount of the calcium powder added to a jug of fluoridated water. (.0045 of a calcium capsule would match the amount of fluoride in a liter of fluoridated water.)
I might also consider adding this minute trace amount to tea as there is a concern about fluoride in tea leaves.

From what I've read, fluoride is a common part of rock and soil everywhere but there is usually sufficient calcium present to bind to the fluorine to turn it into calcium fluoride, which passes through the human body unmetabolized and is harmless.

In areas of China and India where there is not sufficient calcium in the rock and soil, people suffer severe debility from fluorine poisoning.

The fluoride put in our water supply is the toxic variety, with a toxicity level somewhere between lead and arsenic. They claim that it prevents tooth decay but concede that this is only true to the extent that it is applied topically. Drinking it is, then, like drinking extremely toxic sun tan lotion. That is my concern, that I'd rather not be dosed by sodium fluoride in this way.

I know very little about chemistry. I'm wondering if the chemical reaction would actually play out in the way of my hopeful guessing as I described earlier.

You have to hire a chemist to prove your theory. After proving your theory, you will have to have a patent attorney search for results of someome else wanting to develop this possibility and see if it has already been patented.

All of this cost money and I don't think anyone here can answer your question.

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The fluoride put in our water supply is the toxic variety, with a toxicity level somewhere between lead and arsenic. They claim that it prevents tooth decay but concede that this is only true to the extent that it is applied topically. Drinking it is, then, like drinking extremely toxic sun tan lotion. That is my concern, that I'd rather not be dosed by sodium fluoride in this way.

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If you are going to make this a premise please link the scientific data you base it on.

Most places do not use Sodium Fluoride. Think about your question. Do you drink milk? Take a Calcium supplement? Take a daily Vitamin? All of these contain Calcium.

Just asking for my personal use. Not interested in a patent.

Lead and Arsenic are Chronic poisons, Fluorine is not. You need a better understanding of Chemistry before you try to extrapolate things like this.