Sensitivity

Today I had a good 1B patient. The patient had some sensitive areas on the distal of teeth #2 and #16. I put Varnish on them to see if that would help with desensitizing. There was a tiny bit of recession on the distal of those teeth, but no where else. My instructor said that what might have caused that would be impacted third molars because my patient had the third molars taken out and didn't have recession anywhere else. I just had never thought that that would cause sensitivity.