my 2c: drink the mineral water.
at one time i had a bunch of correspondence on fluoride based on local community efforts to have it removed from tap water. tzootsi's info looks bang on from what i recall.
i will add that the reason fluoride was added to drinking water in the first place.. over a century ago i believe... was on the basis of its being a required nutrient for dental health and cavity prevention.
furthermore.. according to wiki, fluoride slows demineralization and increases remineralization of tooth enamel. https://en.wikipedia.org/wiki/Water_flu ... on#History
i suspect there may be something else more fundamental about tooth nutrition that we've learned over the past century, that should allow us to move past the practice of adding fluoride to drinking water. i can bet you, however, that what is NOT going to happen is the reintroduction of magnesium *back* into public drinking water..
Developmental influence of magnesium deficiency on rat molar tooth composition and dental carieshttp://www.sciencedirect.com/science/ar ... 1783801262
"The objective of this study was to determine if caries susceptibility of offspring could be altered by maternal magnesium deficiency. ... Offspring originating from these magnesium deficient dams had less calcium, phosphorus and zinc in molar dentin compared to controls at the end of a 45-day caries test period. This apparent preeruptive reduction in mineral content of offspring dentin was associated with higher caries scores on the first and second molar buccal surface."
that was interesting, i expected magnesium involvement, but wasn't expecting to find poor magnesium status reducing calcium levels, let alone phosphorus and zinc.