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The K18 Leave- in Molecular Repair Hair Mist is part of the professional molecular repair service. This leave-in lightweight mist strengthens hair’s defense prior to damaging chemical services. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes. With just one salon treatment using the K18 PRO service (PRO mist + PRO mask), hair is restored up to: 91% original strength* 94% original elasticity*