Why do I have a black line around my crown?

 / Why do I have a black line around my crown?

Why do I have a black line around my crown?

So I had a crown done awhile ago now. My regular family dentist did the work. I was using a bright flashlight the other night to get a good look at my teeth. And when I shined the light on my crown it appeared transparent. I noticed a little bit of black right around my gums. What is that? Should I have gone to a cosmetic dentist to have the crown done in the first place? I don’t like the way it looks.

– Michelle in Nebraska


Based on what you have described, the crown you have in your mouth sounds like it is a porcelain-fused-to-metal crown. It doesn’t mean that your dentist did anything wrong or that anything is wrong with the functionality of the tooth. That said, a cosmetic dentist places a much higher emphasis on the aesthetics of dentistry. So an excellent cosmetic dentist may have recommended an all porcelain crown.

Some dentists still prefer to use porcelain-fused-to-metal crowns on back molars because the metal structure provides a strong foundation for back teeth. These types of crowns hold up well from a structural standpoint and can withstand extreme biting force. But with the advances in bonding technologies today, many cosmetic dentists are confident that all porcelain crowns will hold up just find on molars. Anyway, the black that is beginning to appear at your gumline is the metal showing through the porcelain. Or if you had a root canal on the tooth, the tooth can appear darker than normal because there is no longer blood circulating to that tooth.

For future reference, you may be interested in learning more about CEREC crowns. These days are also known as same day crowns, because all of the work is done in one visit. That means you don’t have to wear an uncomfortable temporary.

It is still not a bad idea to get into your dentist to have it looked out so the possibility of any tooth decay can be ruled out. Again, it sounds like the metal that is visible, but better to be safe than sorry. Lastly, if this is a indeed a front tooth that you are referring to, then a cosmetic dentist may be the way to go. They care much more about how the end result will look. And all porcelain will look so beautiful that no one will no you had any work done. Good luck!

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