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How to keep your lips moist
Drink more water.
One of the best ways to defend against dry, damaged lips is to make sure you're hydrated from the inside out. Aim to get at least 2 liters (about 8 glasses) a day.
As an added bonus, loading up on water will also make your lips appear more full. Carry a water bottle or thermos with you so you'll have something to sip on all day long.