Normally, about 10% of scalp hairs are in the telogen phase. During this three-month period, the hair root shrivels up into a small white "club," then the hair falls out. It is normal to lose about 100 hairs every day, more of them on days when shampooing loosens the hairs that are ready to fall out. The body then replaces the hairs. Sometimes people worried about losing their hair start noticing hairs on their pillow or in the sink, not realizing that they've always been there. A close look at these will usually reveal the white club at the end, showing that these hairs were already dead!
Third, in most people with inherited pattern hair loss, including both men and women, only the hair follicles on the front and top of the head are sensitive to DHT. The hair follicles on the sides and back of the head are not as much affected by the DHT in the blood. It is these DHT-resistant hair follicles on the back and sides of the head that are moved around to the front and top of the head with hair restoration surgery, thereby creating the appearance of a fuller head of hair. The principles and history of hair restoration surgery are covered in Chapters 10 and 11, and the state-of-the-art transplant procedure called follicular unit micrografting is described in Chapter 12.