We have about 120,000 strands of hairs on our scalp. It grows for about 4 years. It's normal to drop about 90 strands a day. Every time hair falls out, a new strand eventually replaces it. Besides protecting our scalps from the scorching sun and in colder climates controlling heat loss, hair also adds to our beauty and style. The type, color and style of hair are one of the more prominent identifying traits.