PROBLEM TO BE SOLVED: To provide a novel technique involved in a skin quality improvement and hair quality improvement.SOLUTION: The present invention provides a cosmetic kit for skin quality improvement that comprises agent A containing magnesium hydride and oil content and not containing water, and agent B containing carbon dioxide and water; a hair quality improving hair treatment kit that comprises the agent A and the agent B; and a hair quality improving method comprising (I) contacting the agent A to the hair, and (II) contacting the agent B to the hair after the contacting step (I).SELECTED DRAWING: None
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