Root Canal Treatment is a dental procedure used to save a tooth that has deep decay or infection reaching the pulp (nerve) inside. During the treatment, the dentist numbs the tooth with local anesthesia, removes the infected or inflamed pulp from inside the root canals, carefully cleans and shapes the canals, then fills and seals them to prevent reinfection. Finally, the tooth is restored with a filling or crown so it can function normally again, allowing you to keep your natural tooth instead of extracting it.