What Is a Root Canal and Why Is It Done?
A root canal is a treatment that saves a tooth when the soft tissue inside it becomes infected or badly damaged. This soft tissue, called the dental pulp, contains nerves, blood vessels, and connective tissue. It sits in a hollow chamber at the center of each tooth and extends down through narrow channels called root canals.
When bacteria reach the pulp through a deep cavity, a crack in the tooth, or repeated dental procedures, the pulp becomes inflamed or infected. This can cause severe pain, sensitivity to temperature, and swelling. Without treatment, the infection can spread to the bone surrounding the tooth and form an abscess.
During a root canal, the dentist or endodontist removes the infected pulp, cleans and disinfects the inside of the tooth, and fills the empty space with a biocompatible material. The tooth is then sealed and usually restored with a dental crown. The treated tooth stays in your mouth and continues to function normally, even though the pulp has been removed.
Signs You May Need a Root Canal
Tooth pain does not always mean you need a root canal, but certain symptoms strongly suggest the pulp is damaged or infected. Paying attention to these signs can help you get treatment before the problem gets worse.
Common Symptoms of Pulp Damage
- Persistent or spontaneous tooth pain that comes on without an obvious trigger
- Lingering sensitivity to hot or cold that continues after the temperature source is removed
- Pain when biting down or when pressure is applied to the tooth
- Swelling or tenderness in the gum tissue near the affected tooth
- A small bump (fistula) on the gum near the tooth, which may drain pus
- Darkening or discoloration of the tooth compared to the teeth around it
What Causes Pulp Damage
The most common cause of pulp damage is untreated tooth decay. When a cavity grows deep enough to reach the pulp chamber, bacteria enter the pulp and cause infection. A cracked or fractured tooth can also expose the pulp to bacteria, even if there is no visible cavity.
Repeated dental procedures on the same tooth can irritate the pulp over time. Trauma to a tooth, such as a sports injury or a fall, may damage the pulp even if the tooth looks intact from the outside. In some cases, the pulp can die without any obvious cause, a condition called pulp necrosis.
The Root Canal Procedure Step by Step
A root canal follows a predictable series of steps. Understanding each step can help reduce anxiety about the procedure.
Before the Procedure
Your dentist or endodontist will take X-rays to see the shape of the root canals and determine the extent of the infection. Some endodontists use cone-beam computed tomography (CBCT), a 3D imaging scan that provides more detail than standard X-rays. You will receive a local anesthetic to numb the tooth and the surrounding area completely.
During the Procedure
Once the tooth is numb, a small rubber sheet called a dental dam is placed around the tooth to keep it dry and free of saliva. The dentist then creates a small opening in the top of the tooth to access the pulp chamber.
Using small, flexible instruments, the dentist removes the infected or inflamed pulp tissue from the chamber and the root canals. The canals are then cleaned, shaped, and disinfected. This step is critical for removing all bacteria and preventing reinfection.
After cleaning, the canals are filled with a rubber-like material called gutta-percha and sealed with adhesive cement. A temporary filling is placed to close the opening. The entire process typically takes 30 to 60 minutes for a front tooth or premolar and 60 to 90 minutes for a molar.
After the Procedure
You will need to return to your general dentist or a prosthodontist to have a permanent crown or other restoration placed on the tooth, usually within 2 to 4 weeks. A crown protects the treated tooth from fracture, since teeth without living pulp can become more brittle over time. Until the crown is placed, avoid chewing hard foods on the treated side.
Does a Root Canal Hurt?
The short answer is no. A root canal should not be painful. The procedure is done under local anesthesia, which numbs the tooth and surrounding tissue completely. Most patients report feeling pressure but not pain during treatment.
The reputation root canals have for being painful comes from an era before modern anesthesia and techniques. Today, the experience is similar to having a filling placed, though it takes longer. For patients who are especially anxious, sedation options such as nitrous oxide (laughing gas) or oral sedation are available at many practices.
Some mild soreness or sensitivity around the treated tooth is normal for a few days after the procedure. Over-the-counter pain relievers such as ibuprofen or acetaminophen are typically enough to manage this discomfort. If you experience severe pain or swelling after a root canal, contact your dentist or endodontist, as this may indicate a complication.
Root Canal Recovery: What to Expect
Recovery from a root canal is straightforward for most patients. Here is a general timeline of what to expect.
The First Few Days
Mild tenderness or sensitivity at the treatment site is common for 2 to 3 days after the procedure. The area around the tooth may feel slightly sore from the injection site. Over-the-counter pain relievers are usually sufficient. Most patients return to normal activities, including work, the next day.
The First Two Weeks
Any lingering sensitivity typically fades within 1 to 2 weeks. During this time, eat on the opposite side of your mouth to protect the temporary filling. Avoid very hard or sticky foods that could dislodge the temporary restoration. Continue brushing and flossing normally, being gentle around the treated tooth.
When to Call Your Dentist
- Pain that gets worse instead of better after the first 2 to 3 days
- Swelling that increases or spreads to your face or neck
- The temporary filling falls out or feels loose
- You develop a fever
- The bite feels uneven or the tooth feels significantly higher than the others
Root Canal Cost and Insurance
Root canal costs depend primarily on which tooth needs treatment. Teeth with more roots and canals take longer and cost more. Costs vary by location, provider, and case complexity.
As a general guide, a root canal on a front tooth (one canal) typically costs $700 to $1,000. Premolars (one to two canals) range from $800 to $1,200. Molars (three to four canals) range from $1,000 to $1,500. These figures do not include the cost of the permanent crown, which is a separate charge.
Most dental insurance plans cover root canal treatment as a major procedure, typically at 50% to 80% of the allowed amount. If you do not have insurance, many dental offices offer payment plans or financing options. While the cost may seem high, a root canal and crown are usually less expensive than extracting the tooth and replacing it with a dental implant or bridge.
Root Canal by an Endodontist vs. a General Dentist
Both general dentists and endodontists perform root canals. For many straightforward cases, a general dentist is a perfectly good choice. However, an endodontist brings specialized training and equipment that can make a difference for certain situations.
What Is an Endodontist?
An endodontist is a dentist who completed 2 to 3 years of additional residency training focused entirely on treating the inside of the tooth. They perform root canals and related procedures every day, and most use surgical microscopes and 3D imaging that general dental offices typically do not have. You can learn more about endodontists and their training on our endodontics specialty page at /specialties/endodontics.
When to Choose an Endodontist for Your Root Canal
- The tooth has complex anatomy, such as curved or extra canals
- You need a retreatment on a tooth that had a previous root canal
- Your dentist suspects a crack in the tooth
- You were told the tooth may not be savable and want a second opinion
- The tooth is a molar with multiple canals
- You have dental anxiety and want a provider who does this procedure daily
Find an Endodontist Near You
If you need a root canal or have been told your case is complex, an endodontist can help. Every endodontist on My Specialty Dentist has verified specialty credentials. Search by location to find endodontists in your area, compare their experience, and schedule a consultation.
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