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Separating science from tradition with evidence from dermatology, skin physiology, and hair biology. For generations, many people have been taught that greasing the scalp is essential for healthy hair growth. Heavy hair grease—typically formulated with petrolatum (petroleum jelly), mineral oil, and waxes—became a cultural staple long before we understood scalp biology. Today, dermatology paints a much different picture. This article isn’t about demonizing hair grease. It’s ab