Key Benefits Reverses damage and strengthens hair Restores healthy appearance and texture Reduces future breakage A powerful, clinically proven pre-shampoo treatment that leaves hair 3X stronger after just one use.* N°.3 is the complete bond builder to repair and strengthen hair at home by rebuilding all 3 hair bonds. Formulated for all hair types and all levels of hair health, this weekly treatment is key for your healthiest-looking hair. *When used with N°.4 Bond Maintenance® Shampoo How To Use In the shower before shampooing, apply N°.3 from roots to ends until saturated. Leave on for 3-10 minutes, then rinse well. Follow with N°.4 Bond Maintenance® Shampoo and Nº 5 Bond Maintenance® Conditioner. Avoid contact with eyes.