Dry hair is the most fragile type of hair and is subject to breakage, so it must be handled with care. When lathering, be gentle. Avoid any pulling or yanking on your hair in any way, which strains the hair shafts. Don't scrub with your fingernails, which can not only break the hair but irritate your scalp. Work up a lather using your fingertips, instead. Gently rubbing your scalp with your fingertips will also stimulate the oil glands.