Re: Why does mint or menthol make our mouth feel cool?

I am not entirely sure how to answer your question about the mint (I can't 
say I have observed cooling from a mint) but I can point you in the right 
direction for the menthol.

The cooling sensation you are feeling is the same effect as if you have 
ever spilled acetone or rubbing alcohol on your skin, or sweat a lot on a 
very hot day.  The acetone and alcohol have very low boiling points and 
evaporate quickly but they need energy to vaporize.  The molecules are 
absorbing the heat from your skin (or mouth in the case of the cough drop) 
to change their state from liquid (or solid) to gas.  They are essentially 
'stealing' your body heat to turn into a vapor.  You are experiencing a 
cooling effect thanks to this heat transfer.  

I don't believe you can measure the change in temperature from a 
cough drop because it is very small.  Also, your body is very efficient 
about maintaining its internal temperature and a little heat lost to 
evaporate menthol is negligible compared with the normal heat lost through 
your skin every second.  So, the long and the short of it is that the heat 
from your mouth is causing the evaporation of the menthol, which causes the 
cooling sensation in your mouth.

Sorry not to be of help with your whole question but I hope some of this 
information can help you research mint further.  Good luck!

Kieran