Abstract
Adolescence is the stage of life between childhood and adulthood, ranging
from 10 to 19 years. It is a distinct period in human development and crucial for setting
the groundwork for long-term health. Teenagers grow quickly in terms of their
physical, cognitive, and emotional development.In the body of teenagers, major
changes in microorganisms take place. With the development of these changes in the
microbiome of teenagers, diseases are also developed. Teenagers are the future of the
world. Microbiota and diseases have an impact on their emotions, thoughts, decisions,
and interactions with others and their environment. This chapter is written to
acknowledge the readers about the resident microorganisms of the human body during
adolescence and the many kinds of changes that occur in the microbiome due to
lifestyle changes.