Why Is There a Black Line at the Edge of Your Dental Crown?
Dental crowns give patients an alternative to tooth extraction when teeth are badly damaged. However, much like your natural teeth, dental crowns are not faultless. For instance, if you had a dental crown placed over a badly damaged tooth in the smile zone a few years ago, you may now notice that there is a black line around it at the gum line. The most likely reason for this is that you have what is called a porcelain-fused-to-metal crown.