visiting the dentist next week, but wanted to know in advance lay it on me.

[zeek]

its bad isn't it?

 

[TALDDS]

That is difficult to diagnose. Lesions along the gum line and extend into the tooth.
IF they can get clean margins those should look very nice upon completion. I have also had several of them turn into root canals...if you haven't had symptoms you are likely clear