OLAPLEX N°0 is an intensive repair booster that is absorbed by the hair and prepares it for the treatment with OLAPLEX Hair Perfector N°3. As a 2-step treatment, N°0 and N°3 repair broken disulfide bridges in the hair and sustainably strengthen the hair structure.OLAPLEX - an active ingredient that changes everything! The secret weapon of America's top artists for stronger, healthier and shinier hair than ever before. For long-lasting color results and a strengthened and regenerated keratin layer. Protects hair from damage during bleaching and coloring and multiplies and strengthens the structure of the hair. Can be combined with bleaching and coloring products from all manufacturers.