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Either the root canal was incomplete, (one canal or little channel was left uncleaned, waiting to be infected, most commonly happening on a molar) or the crown is 'leaking' at the margins, letting bacteria enter and eat the existing tooth structure.

Or, you may be surprised to find out, it is not the tooth you think it is. Go to your dentist. He may tap your teeth with a metal instrument and find it is the tooth next to it.

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Q: What could be the cause of pain in a tooth that had a root canal done through an existing crown over 5 years ago?
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