system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does room temperature water feel cold (in your mouth) after chewing minty gum?
gpt
You're triggering cold-sensing nerves.

 When you drink water, you're washing other chemicals off of those cold-sensing nerves, and the menthol remaining in your mouth snags right onto them and sets them off.  (You get similar effects when you drink water after eating other foods, like artichokes.)

It doesn't actually lower the temperature of anything, but the nerves think that they do, and that's all that matters.