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Why do some teeth require retreatments of previous root canals?

April 26, 2017canals previous require retreatments teeth

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Why do some teeth require retreatments of previous root canals?

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Sometimes, the interior of a tooth that has had a root canal can get re-infected. This occurs most commonly when recurrent decay allows bacteria to re-contaminate the inside of the tooth. When this happens, the old root canal filling must be removed and the tooth disinfected and filled again.