A recent market research report indicates that more than 1.5 billion people worldwide suffer from chronic pain and that approximately 3- 4.5% of the global population suffers from neuropathic pain, with incidence rate increasing in complementary to age.
So, interpreting salt as table salt, i.e., sodium chloride, the next most common mineral dissolved in seawater is another salt, magnesium chloride.
Fluoride: Uses, Effects and Controversies. Fluoride, the 13th most abundant element on the earth's crust, is a chemical ion of the element fluorine - fluoride has one extra electron that gives it a negative charge. Fluoride is found naturally in soil, water, foods, and several minerals, such as fluorapatite and fluorite. Fluoride concentration in seawater averages 1.3 ppm (parts per million), while in fresh water supplies the natural range is typically between 0.01 to 0.3 ppm.