Like a body scrub, a lip scrub is a semi-liquid or other soft-solid base containing particles that slough off dry, flaky pieces and leave smooth skin behind. ... Properly exfoliated lips better absorb moisturizing agents and protectants such as lip balm. Another added bonus is it is completely edible.
Most people will benefit from exfoliating their lips one to three times per week. For the best results, exfoliate at night and then immediately follow the process with an application of quality chapstick or lip balm. This will ensure that you wake up with smooth and plump lips in the morning.