Annotation: This article discusses aspects of the impact of water quality on the organism of preschool children composed of hypotheses and scientifically proven facts. The features of water as a source of healthy lifestyle and rules for compliance with sanitary rules and norms of the Republic of Kazakhstan have been studied.

Annotation: At the present stage of scientific and technological progress and rapid development of industrial production, the problem of environmental protection is becoming a problem. Air pollution has a serious impact on human health, global and regional climatic conditions. The main types of pollutants are gaseous substances. When fuel burns, carbon monoxide is released during traffic. This is a very toxic gas. Blood easily interacts with hemoglobin and continues to function; therefore, it is important to reduce emissions of toxic substances by vehicles and industrial facilities.

Annotation: The study of the structure of matter is one of the main tasks of chemistry. The problem can be solved with the help of graph theory, which allowed us to find an unexpected way to solve our logical problem. Thus, the aim of our article was to master the theory of graphs for constructing the structural formulas of organic compounds. Prediction of chemical reactions, the possibility of systematization and study of the essence of basic chemical concepts, such as structure, configuration of atoms and molecules, confirmation, isomerism, and, undoubtedly, the quantum-mechanical basis of the interaction of molecules, all this is possible using chemical graphs. Graph theory allows a non-standard way to approach the problem of constructing the structural formulas of molecules of organic compounds.

Annotation: The article is devoted to the actual problem of tooth loss and solving the problem through the development of tissue engineering. Tissue engineering is a set of methods and procedures aimed at the regeneration of biological tissues. It includes a triad of basic elements: stem cells, extracellular matrix or scaffold, growth factors and signaling pathways. An important role in solving the existing problems is associated with stem cells. Dental stem cells are capable of self-renewal and differentiation. Based on the analysis, it was found that each type of dental stem cells has its own characteristics and applications not only in dentistry, but also in other areas of medicine.