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O3
★ Our top pick
Olaplex No. 3 Hair Perfector
8.2
No. 3 is the at-home version of the bond-building treatment that changed salon coloring, built around Olaplex's patented bis-aminopropyl diglycol dimaleate. On genuinely damaged hair - bleach, box dye, daily hot tools - regular use leaves hair feeling stronger, smoother, and less snap-prone, and that's the honest scope of the claim. On healthy virgin hair the difference is subtle to invisible, and it is emphatically not a conditioner: it's a pre-shampoo treatment with its own job. At ~$30 a modest bottle, buy it for the damage you actually have.
Why we rate it
- Regular use noticeably reduces breakage and snapping on bleached and color-treated hair
- The active chemistry is patented and salon-proven - this is the original, not a dupe of one
- Simple routine: damp hair, leave 10+ minutes (or overnight), shampoo out - once a week
Keep in mind
- Results scale with damage - healthy, untreated hair may notice little for the money
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