According to this, naturally occuring fluoride in well water is around 0.05ppm and tap water that has been treated can have 0.7 or more. Quite a big difference.

According to this, naturally occuring fluoride in well water is around 0.05ppm and tap water that has been treated can have 0.7 or more. Quite a big difference. Probably enough to be worth looking into. https://fluoridealert.org/content/fresh_foods/ https://fluoridealert.org/content/fresh_foods/