Why is my brand new zirconium porcelain crown look dark/gray? (photos)

Hello Zelma!
Neither the zirconia or the e-max crown stain or pigment depending on your eating habits because this materials are not porous, do to the characteristics of yours and the fact that it was root canal treated and you mention there was a lot of tooth destruction there is a high possibility that your dentist placed a metallic post underneath the crown is normal that in e-max crowns the color of the metal trespasses this is not something that should be happening with a zirconia crowns  because is a more solid material it should cover whatever color is underneath the crown.

I hope my answer was helpful!

Have a wonderful day!

Hi:Since the tooth is root canaled, the tooth is gray.  However the color of the tooth can be completely covered with opaque cement and also opaque porcelain core.Best,Dr. Maddahi

The dark, root canaled tooth underneath the crown is shining thru, causing the darkness. You need to see a cosmetic dentist who knows how to block out the shade of the tooth before putting in the crown. See if you can find a dentist trained at the Las Vegas institute for advanced dental studies or call them for a dentist near you.