Intensifies repair results with N°.3 Strengthens hair and reduces breakage Rebuilds hair bonds at a molecular level How To Use On dry hair, apply and distribute evenly from root to tip. Leave on for 10 minutes. Do not rinse. Apply N°.3 Hair Perfector™ and comb through. Leave on for 10 minutes. Rinse well. Shampoo and condition with N°.4 and N°.5. Use as a two-part system with N°3 once a week or 2-3x per week for very damaged hair. Avoid contact with eyes. Details Prime your hair for your deepest at-home repair with this salon-inspired pre-treatment to boost the effects of N°.3 Hair Perfector™. The highly concentrated formula rebuilds disulfide bonds to repair more severe damage and immediately strengthens hair when N°.0 is used with N°.3.
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