I have been noticing some pretty bad sensitivity to heat in my two upper front teeth for the past week and a half. I experienced a lot of pain in my teeth after going for a long walk during a day when there were sub-zero windchills/temps. I was joking about how my teeth felt frozen, is it possible that I actually could have damaged the nerves? I have never had a cavity before, I'm in my twenties, and take very good care of my teeth. I was just at the dentist in November and am positive that I do not have a cavity, especially in my front teeth! Has this happened to anyone else? Any suggestions on what to do?