Two root canals typically take between 1.5 and 3.5 hours of total chair time, depending on which teeth are involved. If both procedures are done on the same day, you’re looking at one longer appointment. If they’re scheduled separately, each visit runs 45 minutes to 2 hours on its own.
Time Estimates by Tooth Type
The single biggest factor in how long a root canal takes is which tooth is being treated. Front teeth (incisors and canines) usually have one root canal inside them, so the procedure takes about 45 minutes to an hour. Premolars, the teeth between your canines and molars, typically take around an hour or slightly more. Molars are the most time-consuming because they can have up to four separate canals, each requiring individual cleaning and filling. A molar root canal often runs 90 minutes and can stretch to 2 hours for complex cases.
So if you’re getting two front teeth treated, your combined time could be as short as 1.5 hours. Two molars could mean 3 to 4 hours in the chair. A front tooth plus a molar lands somewhere in between. Here’s a quick breakdown of per-tooth estimates:
- Front tooth (incisor or canine): 45 to 60 minutes
- Premolar: 60 to 75 minutes
- Molar: 90 minutes to 2 hours
These times don’t include placing a crown afterward, which is usually a separate appointment.
Same Day or Separate Visits
Some dentists will do both root canals in a single long appointment. Others prefer to split them across two visits, especially if molars are involved or the cases look complicated. There are trade-offs either way. Finishing everything in one sitting saves you a second trip, but a Cochrane review of the available evidence found that single-visit treatments tend to produce more postoperative pain afterward, along with greater painkiller use. Spreading the work across two appointments gives your body time to recover between procedures.
If your root canals are split into separate visits, most dentists schedule them one to three weeks apart. A temporary medicated filling is placed inside the tooth between appointments, and letting the tooth rest with that medication actually helps inflammation and infection settle down. Gaps of up to six weeks between appointments are generally fine and shouldn’t cause problems, though you don’t want to leave a temporary filling in place indefinitely.
What Makes a Root Canal Take Longer
The per-tooth estimates above assume a straightforward case. Several things can push the clock further. Teeth with unusually curved or narrow canals require more careful, slower instrument work. If a canal has calcified (partially hardened shut over time), your dentist needs extra time to navigate through the blockage. Severe infections sometimes mean the tooth needs additional cleaning cycles before it can be sealed.
The tools your dentist uses also matter. Modern rotary instruments clean canals significantly faster than traditional hand files. One clinical study found rotary tools cut the canal-cleaning portion of the procedure from about 26 minutes down to 19 minutes per tooth. That difference adds up when two teeth are being treated. If your dentist or endodontist uses current technology, you’ll likely be on the shorter end of the time ranges.
Retreatments, where a previous root canal on the same tooth failed and needs to be redone, also take longer than first-time procedures because the old filling material has to be removed before the canal can be recleaned.
What the Appointment Actually Looks Like
Beyond the procedure itself, plan for extra time on either side. Numbing takes about 10 to 15 minutes to fully take effect. Your dentist will place a rubber dam (a small sheet that isolates the tooth and keeps it dry), take X-rays before and during the procedure, and do a final check afterward. For a single root canal, add roughly 15 to 20 minutes of setup and wrap-up time on top of the active treatment. For two root canals in one sitting, some of that prep overlaps, so you won’t necessarily double the overhead.
If you’re scheduling a single appointment for both teeth, block out at least 3 hours to be safe. For two separate appointments treating one tooth each, plan on 1 to 2 hours per visit depending on whether you’re treating a front tooth or a molar. Your dentist’s office can give you a tighter estimate once they’ve reviewed your X-rays and know exactly which canals they’re working with.