Decay or bacteria: Without seeing the black line, it is possible that you could be seeing decay or bacteria at the gumline. If the tooth has a crown on it, it is possible that you are seeing the metal edge of the crown. Have a dentist check your concern to rule out decay. The wisdom teeth are the hardest to keep clean and are often found to have decay.
Answered 6/24/2015
4.8k views
Decay vs debris: Could be decay or debris. For best results, have an oral surgeon examine you and make recommendations.
Answered 6/30/2015
2.7k views
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