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  Fluoride in the water.
Fluoride in higher concentrations found predominantly in the groundwater of areas, aquifers are represented by rocks containing fluorine.
Although calcium fluoride and magnesium fluoride are soluble compounds, the presence in water of calcium and magnesium does not lead to the deposition of CaF2 and MgF2 at those low concentrations of fluoride that are commonly found in natural waters. In this regard, self-purification of rivers of fluoride practically does not occur if there is contamination due to lowering the production of fluorine-containing water or the local river supply ground water containing fluoride.
Hygienists recognized are the optimal rate of fluoride in drinking water within 0.7-1 mg / liter. If you exceed this rate for people who use this water, there is dental fluorosis - white like chalk first appear, and then pigmented spots on the teeth, the strength of the teeth is reduced.
, Studies of dental hygienists found that in low fluoride content in the diet of people, and especially in drinking water, people suffering from dental caries. Ensuring the continued optimal concentration of fluoride in drinking water (0.7-1 mg / L) is probably the most reliable means in the diet of the population necessary doses of fluoride.
In connection with the many water pipes in many countries provides for measures to maintain the drinking water fluoride concentrations optimal. With a lack of fluoride in water fluoridation provides water, i.e., the addition of fluoride to the water of chemical compounds with an excess of fluoride in water compared with the maximum allowable concentration is without fluoride water (water purification from fluorine).
Iodine is found in small amounts in most natural waters. Its physiological significance is associated with the spread of endemic goiter, a disease occurs when a lack of iodine in the diet of people. Considered normal if the drinking water and food together account for every inhabitant of 0.05-0.1 mg of iodine per day. If in the area of ​​natural water contain insufficient iodine intake, the agricultural products grown there, also tend to contain him a little. The preferential distribution in areas with iodine deficiency has received supply of iodized table salt.