Oily hair requires a completely different therapy. It is important to remember that though brushing is very good for healthy hair, too much brushing is not good for oily hair because it stimulates oil glands that are already over-active. You must take care to buy something that will brace the scalp and prevent oiliness. If your hair is oily, it needs ti be washed every third or fourth day. A good nourishing shampoo is often the best for oily hair. Excessive oiliness, when neglected, often leads to falling hair and premature baldness, especially in men, after 35.