The current demographic situation is characterized by a high rate of increase in the proportion of older age people. As a result of age-related changes, the exchange of macro- and microelements is disrupted. Magnesium (Mg), an important structural element, regulates hundreds of enzymes. The level of magnesium in adult people is the lowest as compared with the average in Russia. Also, there is a tendency noted for Mg to decrease with aging. On the territory of the Russian Federation there are 42 types of natural mineral waters used for therapeutic purposes and preventing a wide range of diseases. However, there is no reference found as what criteria can be used to select a certain solution and to evaluate its properties for geriatric dental practice. It is considered adequate and effective to use solutions made from various mineral waters containing magnesium for treating different categories of patients including the elderly. The objective is to select and prove criteria for evaluating the composition and properties of solutions containing mineral waters in geriatric dental practice. According to the obtained data, it is advisable to use solutions containing mineral waters. The composition and properties of mineral waters were preliminarily evaluated by the following indicators: рН, osmolality, macro- cell diffusion rate, changes in light transmission rate in the heated solution. The subject of the study is “Fateevskaya” mineral water which, as it has been proved, can be effectively applied in geriatric dentistry.