What This Guide Covers
This guide explains how long a root canal takes for each type of tooth. It covers what affects the overall length of your appointment and what happens during the procedure.
Root canal therapy (also called endodontic treatment) removes infected or damaged tissue from inside a tooth. The dentist or endodontist cleans the inner canals, fills them with a sealing material, and restores the tooth. The number and shape of those canals are the biggest factors in how long the procedure takes. [1] [3]
Whether you have been told you need a root canal or you are researching the procedure ahead of time, this guide will help you understand what to expect. You can also learn more about the specialty on the endodontics page.
Root Canal Time by Tooth Type
The type of tooth being treated is the single biggest factor in how long a root canal takes. Teeth toward the front of your mouth have fewer canals and simpler anatomy, so they require less time. The AAE notes that a root canal appointment generally lasts about 90 minutes or less, with front teeth on the shorter end and molars on the longer end. [1] The specific time estimates below reflect widely accepted clinical ranges, though individual cases may vary.
Front Teeth (Incisors and Canines): 30 to 60 Minutes
Front teeth typically have one root canal, which makes them the quickest to treat. Most incisors and canines can be completed in roughly 30 to 60 minutes. [3]
Incisors are your four upper and four lower front teeth. Canines are the pointed teeth next to them. Because these teeth have a single, relatively straight canal, the cleaning and shaping process is straightforward.
Front teeth also have thinner roots, which means the endodontist can access the canal quickly. In uncomplicated cases, the entire procedure, from numbing to temporary filling, may take closer to 30 minutes.
Premolars (Bicuspids): 45 to 75 Minutes
Premolars sit between your canines and molars. They typically have one or two canals, and treatment usually takes 45 to 75 minutes. [3]
Upper premolars are more likely to have two canals than lower premolars. When two canals are present, each one must be located, cleaned, shaped, and filled individually. This adds time compared to a single-canal front tooth.
Some premolars have canal anatomy that curves or branches unexpectedly. If the provider finds an extra canal during treatment, the appointment may run slightly longer than expected.
Molars: 60 to 90 Minutes
Molars are the large teeth at the back of your mouth. They have three or four canals, and sometimes more. Treatment typically takes 60 to 90 minutes. [3]
Upper molars usually have three canals, but a fourth canal is common. A literature review by Cleghorn et al. covering the root and canal morphology of the maxillary first molar found that the prevalence of a second mesiobuccal canal (MB2) varied widely, ranging from 18% to over 96% depending on the study method used. [4] Clinical studies using magnification tend to find the MB2 canal more often than studies using the naked eye. This means your provider's equipment and experience can directly affect how thoroughly the tooth is treated. Lower molars typically have three canals but can have four as well. Each canal must be individually located and treated.
Molar root canals also take longer because of access. The back of the mouth is harder to reach, and molar roots tend to curve more than those of other teeth. These factors add time even for experienced providers.
What Affects How Long Your Root Canal Takes
Several factors beyond tooth type can make your root canal shorter or longer than the typical range.
Canal Number and Shape
Canal anatomy varies from person to person. Some teeth have extra canals, curved canals, or canals that branch and reconnect. These variations require more time to locate and clean thoroughly. [3] [4]
An endodontist uses magnification (a dental microscope or loupes) and digital imaging to find hidden canals. Locating every canal is critical. A missed canal can lead to persistent infection and the need for retreatment.
Infection Severity
A tooth with a large infection or abscess (a pocket of pus near the root tip) may need extra steps. The provider may place a medicated dressing, such as calcium hydroxide, inside the tooth and schedule a second visit to complete the filling. [5]
In these cases, the first appointment focuses on draining the infection and cleaning the canals. The second appointment, typically one to four weeks later, finishes the shaping and sealing process. Each visit usually lasts 30 to 60 minutes. This two-visit approach allows the antimicrobial medication time to reduce bacterial load inside the tooth before final sealing. [5]
Retreatment of a Previous Root Canal
If a tooth that had a root canal years ago becomes reinfected, it may need retreatment. This involves removing the old filling material, recleaning the canals, and resealing them. [1]
Retreatments typically take longer than first-time root canals. Removing old filling material adds a step, and the provider must check for missed canals or cracks that caused the original treatment to fail. A molar retreatment may take 90 minutes or more.
Provider Experience and Equipment
Endodontists are dentists who completed two or more additional years of specialty training focused on root canal procedures. Because they perform root canals daily, they are typically faster and more efficient than general dentists who perform them less frequently. [1]
Endodontists also use specialized equipment, including dental operating microscopes, electronic apex locators (devices that measure canal length), and rotary or reciprocating nickel-titanium file systems (motorized instruments that shape canals). These tools can reduce procedure time while improving accuracy. [3]
Single Visit vs. Multiple Visits
Many root canals can be completed in a single visit. The AAE states that treatment typically requires one or two appointments. [1] Research supports single-visit treatment for many non-infected cases. A meta-analysis by Su et al. including 880 teeth found no significant difference in healing outcomes between single-visit and multiple-visit root canal treatment for teeth without periapical lesions. [6] However, some research suggests that teeth with large infections may benefit from a two-visit approach with interappointment medication. [5]
Your provider may recommend two visits if the infection is severe, if the canal anatomy is unusually complex, or if you need retreatment. Two visits does not mean something went wrong. It means your provider is being thorough.
What Happens During a Root Canal
A root canal follows a predictable sequence of steps. Knowing these steps can help you feel more prepared for your appointment.
Step 1: Numbing the Tooth
Your provider applies a topical gel to the gum tissue and then delivers local anesthesia with a small injection. This numbs the tooth and surrounding area. You should feel pressure but not pain. [2]
The numbing process takes about 5 to 10 minutes to take full effect. Your provider will test the tooth before starting to make sure you are completely numb.
Step 2: Placing the Dental Dam
A dental dam is a small sheet of rubber or latex that fits over the tooth being treated. It keeps the area dry and prevents bacteria from your saliva from entering the tooth during the procedure. [1]
The dam also protects you from swallowing or inhaling any small instruments or irrigation solutions. Placing the dam takes about one to two minutes.
Step 3: Creating an Opening
The provider drills a small opening through the top (crown) of the tooth to reach the pulp chamber. The pulp is the soft tissue inside the tooth that contains nerves and blood vessels. [2]
This opening gives the provider direct access to the root canals below. In front teeth, the opening is usually made on the back surface. In premolars and molars, it is made on the chewing surface.
Step 4: Cleaning and Shaping the Canals
This is the longest step. The provider uses small, flexible instruments called files to remove the infected pulp tissue and shape each canal. The canals are flushed with an antimicrobial solution, typically sodium hypochlorite, to kill bacteria and dissolve debris. [3]
The provider measures the length of each canal using an electronic apex locator and confirms measurements with X-rays. Each canal is shaped into a smooth, tapered form so it can be filled completely.
Step 5: Filling and Sealing the Canals
Once the canals are clean and dry, the provider fills them with a rubber-like material called gutta-percha. This material is heated slightly so it conforms to the shape of the canal. A sealer paste is used to bond the gutta-percha to the canal walls. [3]
The access opening is then sealed with a temporary or permanent filling. Your provider will discuss whether the tooth needs a crown (a cap that covers the entire tooth) to protect it long term. Most molars and premolars need a crown after a root canal. [7]
After the Procedure
You can typically return to normal activities the same day. The numbness wears off in two to four hours. Some soreness around the tooth is normal for a few days and usually responds well to over-the-counter pain relievers like ibuprofen. [2]
Avoid chewing on the treated tooth until the permanent restoration (filling or crown) is placed. The tooth is more fragile without a crown and could crack under heavy biting force. A study by Aquilino and Caplan analyzing over 1,300 endodontically treated teeth found that teeth without crown coverage were significantly more likely to be extracted than those with a crown. [7]
Root Canal Cost Factors
Root canal costs depend on the tooth type, your location, and whether a general dentist or endodontist performs the procedure.
Front teeth cost less because they have fewer canals and take less time. Molars cost more because they require more time and more complex instrumentation. Retreatments typically cost more than first-time root canals because of the additional steps involved. [1]
Costs vary by location, provider, and case complexity. As a general range, root canals may cost $700 to $1,500 or more before insurance. A crown, if needed, is an additional cost. Ask your provider for a detailed estimate before your appointment.
Many dental insurance plans cover a portion of root canal treatment because it is considered a restorative procedure. Coverage levels vary by plan, so check with your insurance carrier to understand your copay, any waiting periods, and annual maximums that apply.
When to See an Endodontist
An endodontist is a specialist trained specifically in diagnosing and treating problems inside the tooth. Not every root canal requires a specialist, but certain situations benefit from one.
General dentists perform root canals regularly and handle many straightforward cases. However, your general dentist may refer you to an endodontist if your tooth has complex anatomy, curved or calcified (narrowed) canals, or a history of previous root canal treatment that failed. [1]
You may also want to seek an endodontist if you have dental anxiety. Endodontists are experienced at managing anxious patients and may offer sedation options. Their specialized equipment, including operating microscopes, can make the procedure more precise and often faster.
Consider seeing an endodontist if any of the following apply to your situation:
- Your tooth has a complex root anatomy, such as extra canals or severe curvature.
- You need retreatment of a tooth that had a previous root canal.
- Your general dentist refers you to a specialist.
- You have a cracked tooth and the crack may extend into the root.
- You want the procedure completed by a provider who performs root canals every day.
Find an Endodontist Near You
If you need a root canal or have been referred for one, finding a qualified endodontist is a good next step. Visit the endodontics page to search for board-eligible and board-certified endodontists in your area, read about their training, and learn what to expect at your first appointment.
Search Endodontists in Your Area