Re-RCT is recommended when a previously treated tooth develops complications such as persistent pain, swelling, or reinfection. This can occur due to factors like:
- Undetected or complex root canal anatomy that was not fully treated during the initial procedure.
- New decay that compromises the existing root canal filling.
- Fractured or loose restorations that allow bacteria to enter the tooth.
- Delayed placement of a crown, leading to reinfection.