system
Given the following post, respond as if you're commenting on Reddit:
human
Why does licking your lips make them more chapped?

ELI5: Every time I get chapped lips I end up licking them and this always results in worse chapped lips! Why does this happen?
gpt
Evaporation. You wet your lips, humidity is probably low, so the heat and the lack of moisture in the air carry off your saliva and more moisture, which comes right out of your lips. Which you lick, because they're dry, which repeats the process, making them drier.

Chapstick and other lip balms work by putting a layer of wax down. This prevents moisture from evaporating from your lips, as well as moisture from your tongue getting to your lips to screw up the protective process.