Serum Solide is a beauty touch up that protects and regenerates dry and the most sensitized zones of hair. It helps seal split ends and regenerates hair overnight. It can tame unruly strands, illuminate highlights, and revive dry curls. Using one finger use a circular movement to pick up a small amount of serum and warm between fingers until melted. Then, apply evenly on dry hair to the most sensitized zones (split-ends, highlighted areas, frizzy areas).