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How to prevent oily hair
Wash your hair less often.
While it may seem counterintuitive, washing your hair can actually cause excess oil production. One reason is because shampoo strips your head of natural oil, and your scalp reacts by producing still more.
Also, certain shampoos and conditioners, especially those containing silicone, can leave your hair with more oil or oil-like-substances. If you're used to washing every day, start cutting back slowly and skip only one hair washing per week.