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You Use Too Much Shampoo
You've probably already heard that unless your hair is very greasy, daily washing can strip away the natural oils that leave hair looking glossy. But even if you've already cut back on your shampoo schedule, you could still be oversudsing. The detergents in shampoo do an excellent job of removing the oils that build up at your roots, but they could dry out the rest of your hair. Use just enough shampoo to work up a decent lather (no more than a quarter-size dollop) and work it only into your scalp, never your ends.