What Happens During Root Canal Treatment for Pulpitis?

Root canal therapy is the standard-of-care treatment for irreversible pulpitis—a condition in which the dental pulp becomes inflamed and irreversibly damaged, typically due to deep caries, trauma, or repeated dental procedures. The goal of the procedure is to eliminate infected or necrotic pulp tissue, debride and disinfect the root canal system, and seal it hermetically to prevent reinfection and preserve the natural tooth.

The process begins with diagnostic assessment, including clinical examination and radiographic imaging (e.g., periapical radiographs or cone-beam CT when indicated) to evaluate pulp vitality, root anatomy, apical status, and presence of periapical pathology. Local anesthesia is administered to ensure patient comfort, followed by placement of a rubber dam to isolate the tooth and maintain a sterile field.

Access to the pulp chamber is achieved via a precise cavity preparation, after which the pulp tissue—whether inflamed, infected, or necrotic—is removed using endodontic files. The root canal system is then meticulously cleaned and shaped using rotary or hand instrumentation, combined with copious irrigation (commonly with sodium hypochlorite and EDTA) to remove debris, biofilm, and bacteria. Microbial reduction is further enhanced through antimicrobial irrigation and, in select cases, intracanal medicaments such as calcium hydroxide or chlorhexidine.

Once cleaning and shaping are complete, the canals are dried and obturated—typically with gutta-percha points and a biocompatible sealer—to achieve a three-dimensional seal of the entire root canal space. A temporary or permanent restoration follows, with definitive coronal restoration (e.g., composite, amalgam, or crown) essential to restore function and prevent microleakage. Postoperative follow-up includes clinical and radiographic evaluation at intervals (e.g., 6–12 months) to assess healing and long-term success.