Kérastase is a cult favourite in the haircare world, and for good reason - its scientifically formulated products help any hair type transform into a healthier, shinier incarnation. The Resistance Masque Extensioniste is the hair mask to reach for if your locks are damaged or brittle, thanks to creatine and maleic acid -ingredients that help repair bonds within the hair structure before sealing the cuticle to prevent further damage.
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