system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In what way is the skin inside your mouth (always wet) different than the skin on the rest of your body?
gpt
The skin in your mouth is living cells that is constantly lubricated by saliva. The skin on the outside surface on the other hand is living cells coated with a layer of dead cells and is filled with a substance known as keratin which gives it excellent protection from the wear and tear of everyday activities. Also areas on your body that experience more wear and tear have a thicker layer of dead cells for increased protection(like your soles and palms).