Before wash the hair, our customer very like it. After 1 week wash by herself, the hair dry and dull. We received her feedback, our technician suggested that when washing, soak with conditioner for 10 minutes, then dry naturally, and then touch the essential oil when it is semi-dry and not all dry, so that it will not be dry and the hair will have luster. After wash by our way, the customer feedback the hair become good.