Next to each hair is a sebaceous gland which secrete sebum which lubricates the hair and provides each hair with an element of protection. If the sebaceous glands are overactive greasy or oily hair will result. If the glands are underactive dry hair may result including breakage.
Daily Hair Tip
Rough fingertails can rip and tear delicate hair. Always keep your nails smooth if you use your hands or fingers to style your hair.