A root canal is a dental procedure that removes infected or damaged tissue from inside your tooth, then seals the space to save the tooth from extraction. The term actually refers to two things: the tiny channels inside your tooth’s roots (the literal root canals) and the treatment itself. About 88% of teeth treated with a root canal survive at least five years, and roughly 77% last a decade or longer.
What’s Inside Your Tooth
Your tooth has three layers. The outer shell is enamel, the hardest substance in your body. Beneath that is dentin, a dense supportive layer. At the very center is the pulp, a soft tissue containing nerves, blood vessels, and immune cells. The pulp is what keeps your tooth alive. It detects temperature and pressure, fights bacteria, produces proteins that nourish the dentin, and even generates new dentin throughout your life.
The pulp extends from the crown of your tooth down through narrow channels in each root. These channels are the root canals. When bacteria reach the pulp through a deep cavity, crack, or injury, the tissue becomes inflamed or infected. That’s when the procedure becomes necessary.
Signs You Might Need One
The hallmark symptom is a lingering sensitivity to hot or cold that sticks around for more than a few seconds after the stimulus is gone. This can feel like throbbing, aching, or sharp pain. You might also notice pain when biting down or when your dentist taps the tooth, along with sensitivity to sweets.
In some cases, the nerve tissue inside the tooth dies entirely. When that happens, the temperature sensitivity may disappear, which can trick you into thinking the problem resolved itself. But the infection is still there, and the tooth will still hurt when pressure is applied. Your dentist can confirm whether the pulp is alive or dead using a small electrical pulse delivered to the tooth surface.
What Happens During the Procedure
A root canal typically takes one or two visits. Your dentist or endodontist (a specialist in treating tooth interiors) starts with an X-ray, then numbs the area with local anesthetic. A small rubber sheet called a dental dam is placed over the tooth to keep it dry and free of saliva.
From there, the dentist creates a small opening in the crown of the tooth and uses very fine instruments to remove the inflamed or infected pulp from the chamber and root canals. The empty channels are carefully cleaned and shaped to prepare them for filling. Once everything is disinfected, the canals are filled with a thermoplastic material derived from the sap of a Malaysian tree. This material is heated, compressed into the canals, and sealed with adhesive cement. Despite a common misconception, this filling material is not related to latex and is considered very safe.
Recovery and What It Feels Like
Most people feel some tenderness or sensitivity for a few days afterward, but it’s generally manageable with over-the-counter pain relievers. The discomfort is typically far less intense than the toothache that brought you in. For most people, things feel normal again within a few days.
One important rule: avoid chewing or biting down on the treated tooth until your final restoration is complete. The tooth is more fragile after treatment, and putting heavy force on it too soon can cause damage.
Why You’ll Probably Need a Crown
A root canal removes the living tissue that once nourished your tooth, leaving it more brittle over time. Whether you need a crown depends on where the tooth is and how much structure remains. Back teeth (molars and premolars) handle the heavy work of chewing and almost always need a crown for reinforcement. Front teeth, which bear less force, can sometimes get by with just a filling.
If more than half the tooth structure is gone, or if the tooth has a crack, a crown is strongly recommended. Research has found that root canal teeth without crowns are six times more likely to be lost than those that receive one. The crown is usually placed at a follow-up appointment after the root canal itself has healed.
Root Canal vs. Extraction
When a tooth is badly damaged, the choice usually comes down to saving it with a root canal or pulling it and replacing it with an implant or bridge. In most cases, keeping your natural tooth is the better option. Nothing matches a real tooth in how it looks, feels, and functions.
Extraction is actually a larger procedure than a root canal and is often more uncomfortable during recovery. Beyond the extraction itself, replacing the missing tooth requires additional visits, potentially across multiple specialties, and sometimes extra procedures like bone grafts. Those costs add up quickly. Meanwhile, the gap left by a missing tooth allows neighboring teeth to shift, which can affect your bite and your ability to chew properly.
A root canal followed by a crown is typically less expensive overall than extraction plus an implant or bridge, and it preserves your natural tooth structure.
How Much It Costs
The price depends largely on which tooth needs treatment, because molars have more roots and canals to clean. Based on Delta Dental data, typical out-of-network charges fall in these ranges:
- Front tooth: $620 to $1,100
- Premolar: $720 to $1,300
- Molar: $890 to $1,500
These figures don’t include the cost of a crown, which is a separate charge. Most dental insurance plans cover a portion of both the root canal and the crown, though the exact coverage varies widely by plan. If you’re uninsured, many dental offices offer payment plans or reduced fees.