A root canal removes the infected or damaged nerve inside your tooth
A root canal is a procedure in which a dentist or endodontist (a specialist in tooth nerve problems) removes the nerve and pulp from inside your tooth, then fills the empty space. The pulp is the soft tissue at the center of your tooth that contains blood vessels and nerves. When it becomes infected or dies, the tooth can become painful or abscess. A root canal stops the infection and saves the tooth instead of extracting it.
You do not need a root canal unless something has gone wrong inside the tooth. The most common reason is a deep cavity that has reached the pulp, but a root canal may also be needed after a crack, chip, or repeated dental work on the same tooth. Trauma to the tooth—from a fall or blow to the mouth—can also damage the nerve even if the tooth looks fine from the outside.
The procedure takes one to two hours depending on which tooth and how complex the infection is. Most people feel pressure and vibration during the work but not pain, because the dentist numbs the area first. After the root canal is complete, the tooth is usually capped with a crown to protect it and restore its function.
Key Takeaways
- A root canal removes infected or dead nerve tissue from inside your tooth to stop pain and prevent the infection from spreading.
- The most common reason for a root canal is a deep cavity, but cracks, chips, and trauma can also damage the nerve inside the tooth.
- The procedure is done under local anesthetic, so you should feel pressure but not sharp pain during the work.
- After a root canal, your tooth will need a crown or other restoration to protect it and return it to normal use.
- Root canals have a high success rate and allow you to keep your natural tooth instead of having it removed.
Signs you might need a root canal
The most obvious sign is severe pain when you bite down or when the tooth is exposed to hot or cold. The pain may come and go, or it may be constant. Some people describe it as a sharp, shooting sensation; others feel a dull ache. If the infection has been present for a while, you might notice swelling in your jaw or face, or a small pimple-like bump on your gum near the affected tooth.
Not every toothache means you need a root canal. A cavity that has not yet reached the nerve, a cracked tooth that is still vital, or an abscess in the gum can all cause pain. Your dentist will take an X-ray and may test the tooth with hot, cold, or percussion (tapping) to determine whether the nerve is alive or dead. If the nerve is dead or infected, a root canal is usually the recommended treatment.
Sometimes a tooth that needs a root canal causes no pain at all. You might discover the problem during a routine checkup when your dentist sees a dark spot on the X-ray or notices discoloration of the tooth. This is why regular dental visits matter: catching a problem early can mean a simpler procedure and lower cost.
What to expect during the procedure
Your dentist will begin by taking a fresh X-ray to see the full shape of the root canals inside your tooth. You will receive a local anesthetic injection near the tooth, similar to what you get before a filling. Once the area is numb, the dentist will place a rubber dam around the tooth to keep it dry and isolated from saliva during the work.
The dentist then creates an opening in the crown of the tooth and uses small files to remove the infected or dead pulp from the pulp chamber and root canals. This process is called cleaning and shaping. The files are used in a specific sequence, starting small and gradually increasing in size. The dentist may rinse the canals with sodium hypochlorite or another antimicrobial solution to disinfect them.
Once the canals are clean and shaped, the dentist fills them with a rubber-like material called gutta-percha, which is sealed in place with an adhesive cement. A temporary or permanent filling is then placed in the access hole to close the tooth. If the tooth is very weak or the root canal is complex, you may need to return for a second appointment to complete the work.
Recovery and aftercare following a root canal
Most people can return to normal activities the day after a root canal. You may feel some tenderness or sensitivity in the tooth and surrounding area for a few days, especially when chewing. Over-the-counter pain relievers like ibuprofen or acetaminophen can help manage this discomfort. Avoid chewing on the treated tooth until it has been restored with a crown or other permanent filling.
The temporary filling placed after your root canal is not meant to last. You will need to schedule an appointment with your dentist to place a permanent restoration, usually a crown, within a few weeks. A tooth that has had a root canal becomes more brittle over time because it no longer has a blood supply, so a crown protects it from breaking and restores its ability to chew normally.
If you experience severe pain, swelling, or signs of infection after your root canal, contact your dentist right away. These symptoms are uncommon but can indicate that the infection was not fully cleared or that a new problem has developed. Most root canals are successful, but occasionally a tooth may need retreatment or extraction if the problem persists.
Cost and insurance coverage for root canals
The cost of a root canal varies widely depending on which tooth is affected, how complex the infection is, and whether you see a general dentist or an endodontist. A root canal on a front tooth is typically less expensive than one on a back molar because the roots are simpler. Costs also differ by region and by whether the dentist needs to use specialized equipment or techniques.
Most dental insurance plans cover root canals at 50 to 80 percent of the cost, though some plans have annual maximums or waiting periods. You should check your insurance documents or call your plan to find out what your coverage includes before scheduling the procedure. If you do not have insurance, ask your dentist's office about payment plans or discount programs that may be available.
The cost of the crown that follows the root canal is usually separate from the root canal fee and is also partially covered by insurance. In the long run, saving a tooth with a root canal is often less expensive than extracting it and replacing it with a bridge or implant, which can cost significantly more.
Root canal versus tooth extraction
When a tooth is severely infected or damaged, you have two main options: a root canal or extraction. A root canal preserves your natural tooth, which is almost always preferable because your natural tooth functions better than any replacement. Natural teeth have a periodontal ligament that connects them to the bone and provides feedback when you bite, which artificial replacements cannot fully replicate.
Extraction is simpler and faster than a root canal, and it costs less upfront. However, after extraction you will need to replace the missing tooth with a bridge, implant, or partial denture to prevent your other teeth from shifting and to restore your ability to chew. These replacements are expensive, require ongoing maintenance, and may need to be replaced eventually. A tooth that has had a root canal and a crown can last for decades with proper care.
In rare cases, extraction may be the better choice—for example, if the tooth is so severely damaged that it cannot be restored, or if the infection has spread to the bone in a way that cannot be treated. Your dentist can discuss the pros and cons of each option based on your specific situation.
How to prevent problems that lead to root canals
The best way to avoid needing a root canal is to prevent tooth decay and injury. Brush your teeth twice a day with fluoride toothpaste, floss daily, and limit sugary foods and drinks. These habits reduce your risk of cavities, which are the most common reason for root canals. Regular dental checkups—typically twice a year—allow your dentist to find and treat cavities before they reach the nerve.
Protect your teeth from injury by wearing a mouthguard during sports, avoiding chewing on hard objects like ice or hard candy, and being careful not to crack or chip your teeth. If you grind your teeth at night, ask your dentist about a night guard, which can prevent cracks that might eventually require a root canal.
If you do have a tooth injury, see your dentist as soon as possible. Even if the tooth looks fine on the surface, internal damage to the nerve may not show symptoms for months or years. Early treatment of a cracked or chipped tooth can sometimes prevent the need for a root canal later.
Frequently Asked Questions
Does a root canal hurt?
A root canal should not hurt during the procedure because the area is numbed with local anesthetic. You may feel pressure, vibration, or the sensation of water spray, but not sharp pain. If you do feel pain during the procedure, tell your dentist when ready so they can give you more anesthetic. Some tenderness after the procedure is normal and usually goes away within a few days.
How long does a root canal last?
A root canal can last for the rest of your life if the tooth is properly restored with a crown and you maintain good oral hygiene. The success rate for root canals is high—around 85 to 90 percent. Occasionally a tooth may need retreatment if the infection returns, but this is uncommon.
Can I eat normally after a root canal?
You should avoid chewing on the treated tooth until it has been restored with a crown, which usually takes a few weeks. Once the crown is in place, you can eat normally. For the first few days after the procedure, stick to soft foods and avoid very hot or cold items if the tooth is sensitive.
What happens if I do not get a root canal when I need one?
If you delay treatment, the infection can spread deeper into the root and bone, making the problem more difficult and expensive to treat. The infection may also spread to other teeth or to your sinuses. In some cases, the infection can become serious enough to affect your overall health. Eventually, the tooth will likely need to be extracted.
Is a root canal the same as a filling?
No. A filling treats a cavity by removing the decayed part of the tooth and filling the hole with material. A root canal treats an infected or dead nerve by removing the entire nerve and pulp from inside the tooth. A root canal is a more involved procedure and is needed when decay or damage has reached the nerve.