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
Split ends are a separation of the hair shaft that exposes hair's fragile inner layers. The only real cure for split ends is to have them trimmed.