I had 4 porcelain crowns done 3 years ago due to an accident where my front teeth were knocked out. Now, the gums are atarting to recede and on two of the teeth, they look blue, as if the dead teeth from underneath are showing through. What can be done to fix this? Obviously having veeners done is not inexpensive so I figured they would last a very long time before any issues like this arose. Any advice would be great!
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