Can a cavity form under the crown of a tooth that had root canal treatment?

Question

A couple of years ago I had root canal treatment, and a crown was placed on the tooth soon after. Recently, I have been feeling a slight pain in that same tooth. I noticed that there is a tiny bit showing from under the crown, and I am not sure if it is my actual tooth or what, but the colour seems to be black. Is that a cavity? and if not, is it possible for there to be a cavity formed under the crown, which is what is causing pain, even though I previously had root canal treatment?

Scott Young, DDS · Answer

You can get a cavity under a root canal tooth with a crown.  If you think that you have one you need to call and schedule an appointment with a dentist soon.  Good luck.

Navid Zamani, DMD · Answer

HI, thanks for sending your question. While any previously treated tooth with a crown is susceptible to cavities, most likely the pain may not be necessary due to presence of caries. At times root canal treatments may be required to be retreated due to infection settling in. Its important to see your dentist and have it evaluated promptly to prevent further issues. All the best.

Kourosh Maddahi, DDS · Answer

Hi:You can always get a cavity around the margin of the crown where it meet the tooth.  However, the pain I do not believe is coming from the cavity.  There might be a problem with the root canal.  My suggestion is to go to a dentist to check the tooth as soon as possible.Best,Dr. Maddahi

Can a cavity form under the crown of a tooth that had root canal treatment?

Answers (3)