Curly and coily hair types (roughly 2A through 4C) with moderate to severe damage from coloring, bleaching, keratin treatments, or heat styling. It's aimed at people who want a bond-repair benefit built into an everyday shampoo/conditioner routine rather than a separate treatment step.

It's a consumer, at-home product (not a professional/in-salon service), and it's straightforward enough for a first-time user of bonding-care products. Because it's formulated with curls in mind, it may feel heavier or more emollient than someone with fine, straight, low-porosity hair would want.

Most bond-repair haircare lines are designed around straight or wavy hair and only later get a curl-friendly spinoff; this set works the other way, starting from Redken's Acidic Bonding Concentrate bond-repair chemistry and building it specifically around curl and coil patterns. That means the shampoo and conditioner are trying to do two jobs at once — reinforce chemically weakened bonds with an acidic, low-pH formula, and shape/define the hair's natural curl pattern — rather than treating repair and curl definition as separate problems. For someone whose curls have taken damage from color services or heat but who doesn't want to switch to a totally separate curl-only routine, that combination is the main reason to pick this set over a generic bonding shampoo or a generic curl shampoo.

• Apply Acidic Bonding Curls Shampoo to wet hair, massage through scalp and lengths, and rinse thoroughly.
• Follow with Acidic Bonding Curls Conditioner, working it through mid-lengths and ends, then rinse.
• Use in place of a regular shampoo and conditioner as part of a normal wash routine.
• For more intensive repair, Redken recommends following with the Acidic Bonding Curls Leave-In Treatment (sold separately) as part of the full three-step system.

• Pro: Sulfate- and silicone-free, so it cleanses and conditions without the buildup or color-fading effects some curly-girl routines try to avoid.
• Pro: The citric acid + glycine bonding complex targets internal bond damage rather than just coating hair, which is a meaningfully different mechanism than a standard moisturizing curl shampoo.
• Pro: Simple two-step system that's easy to slot into an existing routine; brand states it is safe for color-treated hair.
• Con: This is the duo only — no leave-in treatment, so more severely damaged curls may need Redken's separate three-piece Trio for the full intended results.
• Con: Contains fragrance and fragrance components (limonene, linalool, citronellol), which can be an issue for scalp-sensitive users.
• Con: Being curl-specific, the conditioner's richness may be too heavy for fine or straight hair, so it isn't a universal bond-repair pick.