Cooling the mouth can quench thirst, potentially because the sensation of cool water is associated with rehydration.

“so so you know one one idea is that just cooling your mouth can sort of quench your thirst right so if you're in the hospital and you're not allowed to drink any fluids they'll give you ice chips to suck on to sort of quench your thirst so why is that and so one idea is that perhaps because water is usually cooler than your body that sensation of water pass it always cools your mouth and so you learn or maybe it's a Nate that just cooling of my mouth means that basically I'm going to be rehydrated”

“Chris um did the same thing where he was recording these thirst neurons just put a cold piece of metal on the mouse's tongue and you can see when you do that these thir go down in activity and then you remove the cold piece of metal and they go back up”