Root canal retreatment is the re-treatment of a previously endodontically treated tooth that has become reinfected, developed new pathology, or was not treated successfully the first time. The procedure involves removing existing root canal filling material, thoroughly re-cleaning all canals (including previously missed ones), and re-sealing the root canal system. With modern microscope-assisted techniques, retreatment success rates are 75–85%, offering a genuine alternative to extraction.
A CBCT scan provides a 3D view of the root canal system, locates missed canals, and reveals periapical pathology missed on 2D X-rays.
The existing crown, post, or filling is carefully removed to access the root canal system from above.
Existing gutta-percha is removed using specialized retreatment files, heat, and solvents such as chloroform or xylene. This is the most time-consuming phase.
A dental operating microscope is used to identify previously missed canals, fracture lines, and canal obstructions — a critical step in retreatment success.
All canals are re-cleaned, reshaped, and disinfected with sodium hypochlorite and EDTA irrigation. An interappointment dressing may be placed.
Canals are re-filled with gutta-percha and re-sealed. A new post, core, and crown are placed to restore the tooth.
1
Visits
2
Days stay
Periapical healing confirmed over 6–12 months on follow-up X-ray
Healing
Crown or filling removal, old gutta-percha removal, microscope-guided canal re-exploration, re-cleaning, irrigation, and re-obturation. Duration: 90–180 minutes. Interappointment dressing placed if needed.
Final obturation if an interappointment dressing was used. Final coronal seal placed.
Crown preparation, digital impression, laboratory fabrication, and cementation of the new permanent crown.
Retreatment salvages a tooth in which you have already invested in a root canal and crown — avoiding the cost of extraction and implant.
Missed canals, inadequate sealing, or coronal leakage are identified and corrected, resolving the persistent infection.
Dental operating microscopes allow retreatment endodontists to see fine anatomical details invisible to the naked eye.
Successful retreatment often eliminates the need for apicoectomy (surgical root-end resection).
Retreatment is more challenging than first-time root canal treatment. Success rates are 75–85%, lower than the 90%+ for initial therapy.
Removing old filling material and posts carries a small risk of creating a perforation in the root. Experienced retreatment specialists minimize this risk significantly.
Retreatment takes 90–180 minutes, longer than initial root canal treatment, due to the complexity of removing old materials.
Some teeth cannot be saved even with retreatment, particularly those with untreatable fractures or severe bone loss. Your endodontist will advise on prognosis before proceeding.
If a medicated dressing is placed between visits, avoid chewing on the tooth. Take antibiotics and pain medication as prescribed.
Mild bite soreness for 1–2 weeks is expected. Use anti-inflammatory medication. Contact the clinic if pain worsens after 7 days.
A new crown is essential after retreatment. The old crown may be reused if still intact, but a new crown is preferred for a proper seal.
A 6-month and 12-month X-ray review is critical to confirm that the periapical lesion is resolving and the retreat was successful.
Most retreatment cases can be managed in a single trip of 7–10 days: the retreatment appointment on day 1 or 2, followed by a new crown preparation and laboratory fabrication over days 3–7. Some complex cases require two visits.