A study of hair density, also known as "how many strands of hair do you have", is the measurement and analysis of the quantity of hair on the scalp. It involves the counting of hair strands within a given area, often expressed as the number of hairs per square centimeter.
Understanding hair density is significant in various fields, including dermatology, trichology, and cosmetic science. It contributes to the diagnosis and treatment of hair disorders, the evaluation of hair transplant effectiveness, and the development of hair care products.