My husband (who never goes to the dentist) just noticed that the two wisdom teeth that he got in a few years ago, are black. I looked and they are definately black. He says they are not painful or anything. Any idea why this would be?? He is not on any meds. He was taking some anti-depressants for a few years - possibly around the time the teeth came in. He does not know if they came in like this or if they turned black recentley. Any ideas would be much appreciated.