L'Oreal Professionnel Serie Expert Liss Ultime Shine Perfecting Serum: By counteracting frizziness and calming unruliness, this leave-in serum helps hair reflect light for intense shineInfused with Reflexium, it also envelops hair with a light, water-soluble film, hair looks fabulously shiny yet not weighed downAdditional Information Â Rub a few pumps between hands and work through the lengths of towel-dried hair. Style as usual. Do not rinse out. Tip-The quantity of serum needed is dependent on how much hair you have and how thick it is. Start with a small amount and add more as needed.