I had 4 Wisdom teeth extracted on the 18th of December. The procedure went well, and recovery was normal. I have no visible issues with any of the extraction sites. Around 4 days ago, however, I noticed a significantly increased sensitivity to cold in the tooth adjacent to the lower right extraction site. Is this simply a case of the nerve becoming more exposed, which will resolve itself as the healing continues, or is this a potential infection that I may want to get checked? Thanks for your help.