Dark tooth under crown showing through - best option? (Photos)

Hi:Unfortunately the discoloration at the gum line is due to the root of the tooth and the tooth being root canaled.  Any remedy will be temporary since if there is any minor gum recession the discolored tooth will show up again.Best,Dr. Maddahi

The problem is that the root of the tooth is darkening, which you can see through the gums. You could possibly have tissue graft to thicken the gums there and mask the color, but that may not achieve the results you want, either. There isn't a way that I know of to whiten the root structure.