Hey stranger ! Everything is fine with the tooth and feels great.
I noticed tah a couple of my upper rear molars have what looks like cracks on the biting surface of the cusp.

Now are these what are clled fissures ?? If so do they mean the tooth is gonna break off there ? I think I have had these for years and they look like a fine black line or crevice. If this does break off the cusp then what ??

Im sosososo gun shy about cracks...