Root canal retreatment is performed when a previously treated tooth develops new infection or fails to heal properly. This may occur due to missed canals, new decay, cracks, or delayed restoration that allows bacteria to re-enter the tooth. The procedure begins with a thorough evaluation and imaging to identify the source of the problem. During retreatment, the dentist removes the existing filling material, cleans and disinfects the canals, and reseals the tooth to eliminate infection. Following retreatment, the tooth is restored with a crown or filling to protect its structure and prevent future issues. Modern techniques allow retreatment to be performed with a high level of precision and patient comfort. Root canal retreatment helps preserve the natural tooth and avoid extraction, maintaining proper bite function and oral health.