A root canal — formally known as root canal therapy or endodontic treatment — is a dental procedure that removes infected, inflamed, or necrotic pulp tissue from the interior of a tooth, then cleans, shapes, and seals the root canal system to eliminate infection and preserve the tooth’s structural integrity.
Despite its reputation, modern root canal treatment is routinely completed under local anesthesia and is no more uncomfortable than having a cavity filled. For most patients, the procedure delivers significant relief from the severe pain caused by pulp inflammation or abscess.
Why Root Canals Are Necessary
The dental pulp is the soft tissue at the core of every tooth, containing nerves, blood vessels, and connective tissue. When bacteria penetrate the enamel and underlying dentin — typically through deep decay, a cracked tooth, or a traumatic injury — they can infect the pulp chamber. Left untreated, the infection can spread into the surrounding bone and periodontal ligament, leading to abscess formation and, in severe cases, systemic complications. Root canal therapy eliminates the source of infection while preserving the tooth’s outer structure.
Common Signs That Treatment May Be Needed
- Severe, spontaneous, or lingering toothache, particularly in response to heat
- Prolonged cold sensitivity that does not resolve within a few seconds
- Darkening or discoloration of the affected tooth
- Swelling or tenderness in the surrounding gum tissue
- A persistent pimple-like bump, called a sinus tract, on the gum near the tooth
How the Procedure Works
Treatment is typically completed in one to two appointments. The clinician accesses the pulp chamber through the crown of the tooth, removes all pulp tissue, and uses a series of progressively sized files to clean and shape each root canal. The canals are irrigated — commonly with sodium hypochlorite — to eliminate residual bacteria, then dried and filled with gutta-percha, a biocompatible rubber-like material that seals the space. A temporary or permanent restoration closes the access opening.
Because the tooth loses its internal blood supply after treatment, it becomes more brittle over time. A full-coverage crown is usually recommended to protect the tooth from fracture, particularly for posterior teeth that bear heavy occlusal forces.
With proper restoration and consistent oral hygiene, a tooth treated with root canal therapy can remain functional for decades — making it a highly reliable alternative to extraction and prosthetic tooth replacement.