This lecture aims to acquaint students with the bases of hygiene of children and teenagers, including the major hygienic problems in this area and the organization of health services for children and teenagers. It also provides a general characteristic of health indicators of children and teenagers in Uzbekistan, emphasizing the importance of hygienic conditions in education and training. The concept of hygiene of children and teenagers (HCT), its purposes, problems, and modern issues within the context of Uzbekistan are explored.