My teeth have gotten whiter in the last few years and as a result my front right
crown (please see attached photo) is noticeably yellow. This along with the dark ridge above the
tooth is something I wish to get corrected. I know the only way to get a super white crown is to get it replaced. I remember distinctly though, that when I got this current crown, it was "A2", which was second to the whitest that was available from that dentist. Does this make sense? Is there a chart?