What Is Root Canal Treatment?

Root canal treatment — formally called endodontic therapy — is a procedure that removes infected, inflamed, or dead tissue from inside the tooth (the pulp), cleans and shapes the root canal system, and seals it to prevent reinfection. The goal is to eliminate pain, save the natural tooth, and restore full function.

Signs You May Need a Root Canal

Symptom Significance

Severe toothache Especially throbbing or spontaneous pain

Prolonged sensitivity Pain to hot or cold lasting more than 30 seconds

Pain on biting Pressure sensitivity suggesting pulp or periapical involvement

Swelling or gum bump Abscess or sinus tract indicating infection

Tooth darkening Pulp death causing internal discoloration

No symptoms Many teeth requiring root canals are pain-free — detected on X-ray

Is Root Canal Treatment Painful?

This is the most common concern — and the most common misconception. With modern local anesthesia and techniques:

• The procedure itself is no more uncomfortable than a filling

• Most patients report that the anticipation is far worse than the reality

• The pain you feel before treatment (from the infection) is what root canals relieve — not cause

• Mild soreness for 2–3 days after is normal and manageable with over-the-counter pain relievers

What Does the Procedure Involve?

Step 1 — Diagnosis and Planning

• Clinical examination and dental X-rays

• Pulp vitality testing

• Treatment explained and consent obtained

Step 2 — Anesthesia

• Local anesthesia administered for complete comfort

• A rubber dam is placed to isolate the tooth and maintain a sterile field

Step 3 — Access Opening

• A small opening is made through the crown of the tooth

• The pulp chamber is accessed

Step 4 — Canal Cleaning and Shaping

• Infected pulp tissue removed using specialized instruments

• Root canals are carefully shaped using rotary files

• Canals irrigated with antimicrobial solutions

• This is the most critical phase — thorough cleaning determines long-term success

Step 5 — Canal Filling

• Canals dried completely

• Filled with gutta-percha (a biocompatible rubber-like material) and sealer

• Access opening sealed with a temporary or permanent filling

Step 6 — Crown Placement

• A crown is strongly recommended after root canal treatment

• The tooth becomes more brittle after the pulp is removed

• A crown protects against fracture — the most common cause of tooth loss after root canal treatment

• See [Crown & Bridge →] for details

How Many Appointments Are Needed?

• Most cases: 1–2 appointments

• Complex cases (curved canals, severe infection, calcified canals): may require 2–3 appointments

• Between appointments: a medicated temporary filling is placed

What Happens If I Don’t Get Treatment?

• Infection will not resolve on its own

• Antibiotics can temporarily suppress infection but cannot eliminate it

• The infection will spread to surrounding bone and adjacent teeth

• Eventually the tooth will require extraction

• An untreated dental abscess can — in rare but serious cases — spread to the jaw, neck, or brain

After Root Canal Treatment — What to Expect

• Mild tenderness for 2–3 days — normal and expected

• Avoid chewing on the treated side until the crown is placed

• Take prescribed or recommended pain medication as directed

• Return promptly if you experience increasing pain, swelling, or fever