TRESemmé Keratin Smooth Shine Serum’s non-greasy formula calms unruly hair for a look that’s perfectly polished and full of natural movement. After you’ve shampooed and conditioned, this TRESemmé Keratin Smooth Shine Serum is the essential step in creating your smooth, glossy style. Designed with a non- greasy formula, this serum leaves hair healthy-looking and polished, sealing in all the head-turning shine.