A. Porcelain crowns do look very natural because they allow the colour of the underlying tooth to come through . Obviously in your case this is not a great idea as you have a dark tooth. In this instance an all porcelain crown with an opaque inner core can be used – such as procera or lava crown. The other option is to have a metal based crown which is covered in porcelain. This can look very natural provided a highly skilled Dental technician makes it.