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Don't Wear Too Much Makeup on Your Forehead
With every expression, your forehead moves. (Or, at least, it should.) So if it's covered with more than a very thin layer of foundation, the makeup will crease—an "undesirable look," as makeup artist Napoleon Perdis delicately puts it. His solution: Dot foundation only on your cheeks, chin, and nose; then blend any extra product up to your hairline.