What Is Root Canal Retreatment?

Root canal retreatment is a procedure in which a previously root canal-treated tooth is reopened, the existing filling material removed, the canals re-cleaned and re-shaped, and the tooth resealed. It is performed when a tooth that has already had root canal treatment fails to heal properly or develops new infection.

Signs That Retreatment May Be Needed

• Pain or sensitivity in a previously treated tooth

• Swelling or tenderness near the treated tooth

• A new abscess or sinus tract (gum pimple) near the tooth

• Findings on X-ray: persistent or new periapical (bone) lesion

• Loose or broken crown on a previously treated tooth

Dr. Kim will evaluate all factors honestly and present your options clearly — the goal is always to help you make the best long-term decision for your oral health.

Prognosis of Retreatment

Success rates for retreatment are slightly lower than initial treatment but still very favorable:

• Initial root canal treatment: 85–95% success

• Root canal retreatment: 75–85% success

Many retreated teeth go on to function for decades with proper restoration and maintenance.

When Is Retreatment Not Possible?

In some cases, the anatomy or condition of the tooth makes conventional retreatment impossible or unlikely to succeed. In these situations:

• Endodontic surgery (apicoectomy) — surgical removal of the root tip and sealing from the end — may be an option

• Extraction followed by implant placement may be the most predictable long-term solution

• Dr. Kim will refer to a specialist endodontist if general retreatment is necessary to ensure the best results.