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The Kérastase Première Anti-Frizz Reparative Filler Serum is a leave-in repairing anti-breakage hair serum that works to seal hair strands, protect them from the heat of styling tools, and prevent frizz, leaving hair looking and feeling shiny and strong. The Kérastase Première range helps reconnect broken keratin bonds for stronger, healthier-looking, shinier hair **. Repair persistent damage and reconnect broken keratin links by leaving on the Kérastase Première Decalcifying Repairing Pre-Shampoo Treatment without rinsing, before layering with Kérastase Première Decalcifying Repairing Shampoo, then rinsing out both. Finish with Kérastase Première Decalcifying Repairing Conditioner as a final step, and discover stronger, healthier-looking, and shinier hair – as if renewed. RESTORES HAIR'S ORIGINAL STRENGTH* How To Use Apply on towel-dried hair. Leave-In. Blow-dry and heat style.