As you look at your smile, have you started to notice a thin black line forming at the base of your crown? It may be right where it meets your gums, but this can make you feel self-conscious about showing off your grin. Regardless, it’s a common issue with porcelain-fused-to-metal (PFM) crowns. The good news is it can be fixed with modern restorations, but here’s more about why this is happening.
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