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. Every year, millions of root canals are performed, and the procedure has a high success rate. Despite its reputation, a root canal is comparable to getting a filling, and most people feel significant relief within three to five days.
What’s Inside Your Tooth
To understand why a root canal is necessary, it helps to know what’s going on beneath the surface. The visible part of your tooth is hard enamel, but inside there’s a soft core called the pulp. This pulp contains nerves, blood vessels, and connective tissue that helped your tooth grow during development. It runs from a central chamber near the crown of the tooth down through narrow channels in each root, ending at small openings at the root tips.
When bacteria reach this inner tissue through a deep cavity, a crack, or repeated dental work, the pulp becomes inflamed or infected. Once that happens, the tissue can’t heal on its own. Without treatment, the infection can spread to the bone surrounding the root, forming an abscess.
Signs You Might Need One
The most telling symptom is pain that lingers after exposure to hot or cold. A healthy tooth might feel a quick zing from ice water, but the sensation disappears within a couple of seconds. An infected tooth often hurts for 30 seconds or longer after the trigger is removed, and the pain can come on spontaneously with no trigger at all.
Other signs include:
- Pain when biting or pressing on the tooth
- Swelling in the gums, face, or jaw
- A persistent pimple-like bump on the gums that may drain pus
- Pain that gets worse when lying down or bending over
- Fever, general malaise, or swollen lymph nodes in more acute cases
Your dentist will confirm the diagnosis using a combination of cold tests, tapping on the tooth, pressing on the surrounding gum tissue, and X-rays. Sometimes a cone-beam CT scan provides a three-dimensional view of the root structure to reveal problems that standard X-rays miss.
What Happens During the Procedure
A root canal typically takes one or two appointments, depending on the tooth’s complexity. Here’s what to expect.
Numbing and Access
Your dentist or endodontist (a root canal specialist) numbs the area with local anesthesia, the same type used for fillings. Once you’re comfortable, they place a small protective sheet over the tooth to keep it dry. Then they create an opening in the crown to reach the pulp chamber inside.
Cleaning and Shaping
Using tiny, flexible instruments, the dentist removes the infected pulp tissue from the chamber and down through each root canal. The canals are carefully shaped and flushed with a disinfecting solution to eliminate bacteria. In some offices, laser-activated irrigation systems sterilize the canals more thoroughly than traditional rinsing alone, which can reduce the risk of reinfection and speed up healing.
The number of canals varies by tooth. A front tooth usually has one canal. Premolars have one or two. Molars, the large teeth in the back, commonly have three or four, which is why molar root canals take longer and cost more.
Filling and Sealing
Once the canals are clean and dry, they’re filled with a rubber-like material called gutta-percha, which has been the standard filling material for over a century. A sealer paste bonds the gutta-percha to the canal walls. Newer biocompatible sealers are antibacterial, dimensionally stable, and can actually encourage the surrounding bone to heal and mineralize.
After the canals are sealed, the opening in the crown gets a temporary or permanent filling. Most teeth that have had root canals need a crown placed afterward, because removing the pulp and creating the access opening weakens the remaining tooth structure. Your dentist will typically schedule the crown placement within a few weeks.
Recovery and What to Expect
Once the anesthesia wears off, expect some soreness around the treated tooth and mild discomfort when chewing. This is your body’s normal inflammatory response. Discomfort usually peaks within the first 24 to 48 hours and improves steadily from there. Most people feel substantially better within three to five days, and by the end of the first week, only occasional sensitivity to biting may remain.
Over-the-counter pain relievers like ibuprofen or acetaminophen are typically enough to manage the soreness. Avoid chewing directly on the treated tooth until the permanent crown is placed. Continue brushing and flossing normally.
Pain that gets worse instead of better after a week, significant swelling, severe throbbing, or fever are signs that something isn’t healing properly and need prompt attention.
How Much a Root Canal Costs
Cost depends primarily on which tooth is involved, because more canals mean more work. Based on Delta Dental data, typical out-of-network ranges are:
- Front tooth: $620 to $1,100
- Premolar: $720 to $1,300
- Molar: $890 to $1,500
These figures cover the root canal itself. A crown afterward adds to the total. Dental insurance often covers a significant portion of the procedure, so your out-of-pocket cost may be considerably less. Even with the added cost of a crown, saving the tooth is generally less expensive than extracting it and replacing it with an implant or bridge, which involves additional procedures, multiple specialist visits, and sometimes bone grafts.
Root Canal vs. Extraction
When a tooth is severely damaged, you may face a choice between a root canal and pulling the tooth. In most cases, keeping your natural tooth is the better option. Nothing matches a real tooth in terms of feel, chewing function, and appearance. Extracting a tooth also creates a gap that can cause neighboring teeth to shift over time, changing your bite and potentially creating new problems.
Replacing an extracted tooth with an implant or bridge requires additional dental visits, possibly across multiple specialties, and the total cost frequently exceeds that of a root canal plus crown. The extraction itself is often a larger, more uncomfortable procedure than the root canal would have been. There are situations where extraction makes more sense, such as when a tooth is fractured below the gumline or has insufficient structure to restore, but when both options are viable, saving the tooth is usually the more practical and affordable path.