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
A good volumizing trick is to mix equal parts of hair mousse and gel together and then paint sparingly on the roots of your hair before blow drying with a make-up brush.