As occasionally what happens with any dental and medical procedure, a tooth may not heal as expected after initial treatment for a variety of reasons. Root canal therapy was performed on this patient many years ago. Patient notes a bad taste in mouth as well as an occasional "pimple". The x-ray shows a well delineated lesion at the apex of one of the roots. This lesion at the apex is an infection that has not healed. Root-canal retreatment is indicated for this patient in order to save the tooth. Whenever possible, it is best to save the natural tooth. Retreated teeth can function well for years, even for a lifetime.
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