What does lip liner do to your lips?

Lip liner is usually used to fill in color to your lips...you can buy it in many colors, it makes them blend or pop, depending on the color. There is no damadge done to the lips or any permanent color stain, unless bought to be that way. Lip Liner comes off just like regular lipstick, but not easily like some, depending on how good the brand is, and what condition the lip-liner stick is in. Usually a clear, glossy lip-gloss is used over the Lip-liner, or a lip gloss of choice, but that is optional. Hope this helped [: