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K18 Biometric Hairscience Leave In Molecular Repair Hair Mask 1.7 OZ variantID_c333f875-ae8d-4363-bc7d-a28e38dca518 tongue labelsK18 Biometric Hairscience Leave In Molecular Repair Hair Mask is a revolutionary hair treatment. Made to be used by those who have damaged hair because of bleaching, chemical styling, and heat styling. Repairs your hairs keratin bonds and helps to restore strength, shine, and manageability. This is a no rinse treatment. Works when applied to hair after shampooing. Allow mask to sit on hair for 4 minutes prior to styling. Do not rinse mask. Ingredients