Why Does a Root Canal Fail?

• Missed canals that were not treated during the original procedure
• Curved or narrow canals that were difficult to clean completely
• Delayed crown placement after root canal, allowing recontamination
• New decay reaching the root canal filling
• Cracked tooth allowing bacteria to re-enter
• Breakdown of the sealing material over time

Signs a Root Canal Has Failed

Pain or sensitivity in a previously treated tooth, swelling or tenderness near the tooth, a pimple or abscess on the gum, or a dark shadow at the root tip on X-ray (periapical lesion) are all signs that a previously treated tooth may need retreatment.

The Retreatment Procedure

The crown or restoration is removed to access the tooth. The previous root canal filling material (gutta-percha) is removed. The canals are thoroughly cleaned, reshaped, and disinfected. The canals are refilled and sealed. A new crown is typically placed after retreatment.

Retreatment vs. Extraction

Retreatment is almost always preferable to extraction when the tooth can be saved. Saving your natural tooth preserves bone, maintains proper bite function, and avoids the cost and complexity of tooth replacement. We will evaluate your tooth and give you an honest assessment of whether retreatment is likely to succeed.