Endodontic retreatment is the re-cleaning, re-shaping, and re-filling of the root canals of a tooth after the first root canal has failed or become reinfected. The dentist or endodontist removes the old root-canal filling material, disinfects the canals thoroughly, and then places new filling material to eliminate infection and restore healing.

Why Endodontic Retreatment Is Needed

A tooth that has already had a root canal may fail to heal for several reasons:

Persistent or new infection inside the canals
Missed or complex canals that weren’t treated the first time
Poorly fitted crowns or fillings that allow bacteria back in
New decay around the restoration
Broken, leaking, or aged root canal filling
Cracks or fractures in the tooth
Delayed placement of the final crown, allowing contamination

How The Procedure Is Done
Examination & X-rays
The dentist evaluates the tooth’s condition and identifies the cause of failure.

Removing old restoration
The crown or filling may be removed to access the canals.

Re-cleaning & reshaping the canals
The dentist thoroughly removes infection, debris, and bacteria.

Disinfection
Irrigants and medications are used to create a bacteria-free environment.

Re-filling the canals
The canals are sealed again with fresh filling material to prevent reinfection.

Final restoration
The tooth is rebuilt with a new filling or crown for strength and protection.

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