Among the functions of hair is to protect against external factors, and it is also an attribute of health and beauty. Hair originates from the hair follicle, and many components are involved in its development that ultimately make up the type of hair, it will vary with age and lifestyle. Along with the root of the hair are the sebaceous glands, which produce oil or sebum. This fat serves to protect both the scalp and hair from external agents. Hair is genetically determined by different factors and has a high hereditary component, so that characteristics are inherited from parents to children, such as hair color, thickness, etc. Hair type can be classified based on different parameters:
- Amount of oil on the scalp (oily, dry, normal)
- Amount of water contained in the hair
- Hair thickness
- Hair color
- Hair shape (straight, curly, etc.)