some cracks show up on x-ray and some do not. i don't know what he means by fuzzy. i don't trust anyone who puts in root canals in the first place. if you wanted to, you could go to an eye ear nose and throat dr or a facial reconstruction surgeon and get a cat scan of your jaws, the kind with the tiny high density pics. that would tell you if there is any difference in bone density. but, the root canals will eat your bone.