Conversation: The conversation between human and AI assistant.
[|Human|] My bottom second to the back tooth, may have been filled at one time. Has a black line between the gum and tooth. On the inside of the mouth and outside cheek area. It"s like someone tried to make a circle around the tooth with a black ink pen. I "m just starting to feel a little pain in it now. It has just showen up it wasn"t there a few days ago . What could this be?
[|AI|]  Thanks for your query, I have gone through your question, the black line between the tooth and the gum could be a hard deposit or calculus(black)...if it is on the gingival it could be a normal melanin pigmentation which usually occurs in smokers called smokers' Melanesia...nothing to worry get your teeth cleaned...if you have the habit of smoking stop it gradually...maintain oral hygiene...consult an oral physician...I hope my answer will help you...take care.