Another one on the list of most common hair problems that you should know and then try to deal with must include dull hair. The hair scalp has a natural oil called sebum and this helps to keep the scalp lubricated. Sometimes, the sebaceous glands work overtime and produce too much sebum, resulting in a greasy hair scalp. The hair can look limp, dull and lifeless and it may be harder to manage. In order to deal with greasy hair, consider washing it with a mild shampoo that is formulated to control natural oil. Once cleansed, it is important to keep your scalps oil levels balanced.