What does the term "density" refer to in relation to hair on the scalp?

The term "density" in relation to hair on the scalp refers to the number of active hair follicles per square inch. This measurement indicates how many hair strands grow from the scalp in a specific area, and it is a critical factor in determining the overall fullness and volume of a person's hair. High density means that there are many hair follicles packed closely together, which typically results in thicker-looking hair, while low density indicates fewer follicles and can make the hair appear more sparse.

Understanding hair density is essential in cosmetology, as it influences various aspects of hair care, styling, and treatment decisions. For instance, different styling techniques and products may be recommended depending on whether a client has high, medium, or low hair density.