Hair fiber is composed of millions of internal bonds. Heat devices, dyes and bleaching break these bonds and the hair looks visibly damaged: split ends, straw effect, breakage. Strong internal bonds are the secret to healthy hair. For the first time, our Pro Bond Repair protocol with Citric Acid recreates, rebuilds and strengthens broken internal hair bonds. Hair is restored and recovers its original strength. The Protocol: Start by generously applying the SOS Pre-Shampoo to your wet lengths. Leave on for 5 minutes and then rinse. Then, apply the Sulfate Free Shampoo followed by the Intense Conditioner. 1 x SOS Pre-Shampoo (200 ml), 1 x Sulfate Free Shampoo (200 ml)