Liquid eyeliner: Liquid eyeliner lasts from three to six months, similar to mascara. Liners: Liners—including gel eyeliners, pencil eyeliners, and lip liners—can last up to one year. You should sharpen your liners every couple of uses to shave off any bacteria-laden bits and avoid eye infection.

What happens if you put expired eyeliner on?

Although eyeliner tends to last longer before expiring, it still runs the risk of germ contamination if you use it past its expiration. So you don't develop any sort of eye irritation or infection, it's best to just say goodbye to any old eyeliners.

How long can you keep eyeliner?

Liquid eyeliners present the same concerns as mascara, so they should be replaced every three to six months. Eyeliner pencils, however, should last you up to two years. Sharpen your pencil with each use to keep it fresh.