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Fenty Beauty by Rihanna The Comeback Kid Instant Damage Repair Treatment ($36)

Marjan swears this product produces visible results with just one use. Available in both a five-ounce and two-ounce size, the formula can be left in or rinsed out. It works well with all hair types but is specifically crafted for strands damaged from heat styling, chemical services, and coloring. You can use it in place of your conditioner if you choose.