Conversation: The conversation between human and AI assistant.
[|Human|] I just noticed that on my back molars there is a thick blakish-gray ring on the front sides, and on both of them there are thin gray vertical lines going from the bottom to the top. I am trying to see my dentist ASAP but am worried about what it could be. I am 20 yr. old female.
[|AI|]  Thanks for your query, I have gone through your query. The blackish gray ring on the molar teeth can be stains secondary to coffee or tea. The thin grayish line can be a deep groove on the tooth surface with stains, or it can be initial stages of decay. Nothing to be panic, consult an oral physician and get it evaluated. If it is stains, get your teeth cleaned once. If it is secondary to a deep groove or decay, then get your teeth restored with tooth color restoration. I hope my answer will help you, take care.