powerful, clinically proven pre-shampoo treatment that leaves hair 3X stronger after just one use.* No.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 No.4 Bond Maintenance Shampoo KEY BENEFITS ? Reverses damage and strengthens hair ? Restores healthy appearance and texture ? Reduces future breakage 3M Reverses hair damage in as little as 3 minutes 3X stronger after one use* 90% smoother, better detangling, more conditioned** *When used with Nº 4 Bond Maintenance Shampoo **When used as a system of Nº 3, Nº 4, Nº 5 TEST RESULTS 3M Reverses hair damage in as little as 3 minutes 3X stronger after one use* 90% smoother, better detangling, more conditioned** *When used with Nº 4 Bond Maintenance Shampoo **When used as a system of Nº 3, Nº 4, Nº 5 USAGE RESTRICTIONS Avoid contact with eyes.