Discover the New Elvive Bond Repair Leave-In Serum by L'Oréal Paris. This leave-in serum forms the fourth and final step in the new Bond Repair haircare routine for stronger hair with maximum shine and heat protection. Hair is made up of millions of bonds that give it structure and strength. When hair bonds break, through brushing, bleaching, heating, and styling, hair becomes weak and damaged. Preparation and Usage Use as a finishing touch in the Bond Repair routine for maximum shine and heat protection. Rub two drops between the palm of your hands. Apply evenly through the lengths and ends of wet or dry hair.