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Beauty reviewed Olaplex's No.3 Hair Perfector, which is part of their numbering system for hair care. The lower the number, the earlier it should be used in the routine, and the higher the number, the later it should be used. Beauty recommends using the No.3 Hair Perfector as the first step in the routine, followed by No.4, No.5, and then either No.6 or No.7 depending on whether the user styles their hair and needs more protection or damage repair.