Root canal treatment is a procedure used to repair and save a tooth that is badly decayed or becomes infected. During a root canal, the nerve and pulp are removed, and the inside of the tooth is cleaned, disinfected, and sealed. Without treatment, the tissue surrounding the tooth will become infected, and abscesses may form, leading to severe pain, bone loss, and even systemic infection.

Understanding the anatomy:

• Root canal: The natural cavity within the center of the tooth.

• Pulp (pulp chamber): The soft area within the root canal containing nerves, blood vessels, and connective tissue.

• Tooth’s nerve: Lies within the root canal. Its only function is sensory — to provide the sensation of hot, cold, or pain. The presence or absence of a nerve does not affect the day-to-day functioning of the tooth once the tooth has emerged through the gums.

When is a root canal needed?

• Deep decay reaching the pulp (visible on X-rays or as a large cavity)

• Cracked or fractured tooth exposing the pulp

• Trauma to the tooth (even without visible cracks)

• Repeated dental procedures on the same tooth

• Abscess or pus formation at the root tip

The procedure (step by step):

1. Anesthesia: Local anesthetic numbs the tooth and surrounding area.

2. Isolation: A rubber dam isolates the tooth to keep it dry and sterile.

3. Access opening: The dentist drills a small opening through the chewing surface.

4. Removal of pulp: Tiny instruments (files) remove the infected or dead pulp.

5. Cleaning and shaping: The canal is cleaned with antiseptic solutions and shaped for filling.

6. Sealing: The canal is filled with a biocompatible material (gutta-percha) and sealed with cement.

7. Restoration: A crown or permanent filling is placed to protect the tooth.

Success rates and statistics:

• More than 15 million root canals are performed each year in the United States alone (American Association of Endodontists).

• Success rate: Over 95% for teeth properly treated and restored (Journal of Endodontics, 2006).

• Root canal-treated teeth can last a lifetime with proper care, though most require a crown within 6–12 months.

Common myths vs. facts:

• Myth: Root canals are painful.
  Fact: The pain comes from the infection; the procedure relieves pain. Modern anesthesia makes it comparable to getting a filling.

• Myth: Root canals cause illness.
  Fact: No valid scientific evidence supports this claim. Root canals eliminate infection, not cause it.

References:

• Nair, P.N.R. “On the causes of persistent apical periodontitis.” J Endod, 2006.

• AAE. “Guide to Root Canal Treatment Outcomes.” 2020.

• Friedman, S. “Prognosis of initial endodontic therapy.” Endodontic Topics, 2002.