Is it normal for a root canal to take two visits?
Cited to 4 sources. Reviewed 2026-08-25.
Yes. The AAE says most root canals can be done in one to two appointments, each around ninety minutes. A second visit is a normal clinical choice, not a sign something went wrong. It is used when the tooth was badly infected, when the canals need more time to disinfect, or when the anatomy is complex. Between visits a medicated dressing sits in the canals under a temporary filling.
- Typical number of visits
- 1 to 2
- Typical appointment length
- About 90 minutes
- Between visits
- Medicated dressing under a temporary filling
- Two visits means failure
- No
What to expect, step by step
Anesthetic, rubber dam, access opened, pulp removed, canals cleaned and shaped. A dressing goes into the canals and a temporary filling seals the tooth.
What to do: Do not chew on the tooth. Expect tenderness to biting for a few days.
The tooth usually settles progressively. Some tenderness to bite is normal, and it should be improving.
What to do: Keep chewing on the other side, protect the temporary filling, and call if the temporary comes out or pain climbs.
The dressing is removed, the canals are checked and finally filled with gutta percha, and the tooth is sealed again.
What to do: Book the permanent crown or filling with your general dentist promptly after this.
A short repeat of the usual soreness, then settling over a few days.
What to do: Get the permanent restoration placed. The endodontic work is not protected until it is.
Why a dentist splits it into two
The decision is about disinfection and about symptoms, not about time management. Heavily infected teeth, teeth with a dark area at the root tip, teeth that are actively draining or swollen, and teeth with unusual anatomy are the ones most likely to be staged.
Leaving a medicated dressing in the canals for a week or two gives an antibacterial agent time to work in spaces that instruments cannot reach. Calcium hydroxide is the traditional choice for this interim dressing. It is a well established approach with a long history in endodontics.
One visit versus two: what the evidence actually says
This is one of the most studied questions in endodontics and the honest summary is that it is not settled. Systematic reviews comparing postoperative pain and flare up rates between single visit and multiple visit treatment have not produced a clean, consistent winner, and reported differences are small.
What that means practically is that neither approach is the wrong one. A dentist who finishes in one visit is not cutting corners, and a dentist who stages it is not struggling. The right call depends on the tooth in front of them, and it is a reasonable thing to ask about.
Living with the gap
The interval is usually one to a few weeks. The main job during it is protecting the temporary filling, because it is the only thing keeping bacteria and saliva out of canals that are still open underneath.
- No chewing on that tooth at all
- No gum, toffee or anything sticky that could pull the temporary out
- Floss gently, sliding the floss out sideways rather than snapping it upward
- Call the same day if the temporary comes out or cracks
- Do not let the second appointment drift by months
When a second visit is added unexpectedly
Sometimes what was planned as one visit becomes two. Common reasons are an extra canal found during treatment, a canal that is blocked or calcified and needs more time, persistent bleeding or drainage from the canal, or the appointment simply running out of time on a difficult molar.
None of those are bad news. Finding an extra canal in particular is the opposite: missed canals are one of the AAE's listed reasons teeth need retreatment later.
Call your dentist or oral surgeon if
- The temporary filling comes out or breaks between visits
- Pain that climbs after the first visit rather than settling
- Swelling of the gum or face between appointments
- A bad taste or a bump appearing on the gum
- You cannot get the second appointment for months (raise it with the office, do not just wait)
- Fever with facial swelling, or trouble breathing or swallowing (emergency care immediately)
Related questions
How long can I safely wait between root canal visits?
Usually one to a few weeks, as scheduled. The medicated dressing and temporary filling are not designed to sit for months, and a leaking temporary lets bacteria back in.
Is a two visit root canal more painful?
You get two rounds of the same short soreness rather than one. On flare up rates specifically, the comparative evidence between one and two visit treatment is mixed rather than conclusive.
Why did my dentist send me to an endodontist for the second visit?
Usually because the anatomy turned out to be more complex than expected. Endodontists use magnification and illumination to find canals that are hard to see, which improves the odds of getting it right the first time.
Sources
- Root Canal Explained (American Association of Endodontists)
- Root Canal Treatment Patient FAQs (American Association of Endodontists)
- The prevalence of postoperative pain and flare-up in single- and multiple-visit endodontic treatment: a systematic review (International Endodontic Journal (PubMed))
- Prevalence of endodontic flare-up following intracanal medicament placement in permanent teeth undergoing endodontic treatment: a systematic review (PMC)
Reviewed against the sources above on 2026-08-25. General information only, not dental advice. Your own provider's aftercare instructions come first.
Keep reading
No. A temporary filling is a short term seal, not a chewing surface. The AAE is direct about it: do not chew or bite on the treated tooth until it has been permanently restored by your dentist. Chewing on a temporary can dislodge it, which lets bacteria back into the cleaned canals, and it can crack the hollowed out tooth underneath. Chew everything on the other side until the crown or permanent filling is in.
A flare up is a sudden spike of severe pain, swelling, or both, that starts within hours or days of a root canal appointment and is bad enough to need unscheduled care. It is uncommon: reviews of the literature put severe flare ups in roughly the low single digit percentage of cases. Once managed, most settle over about two to three days, and it does not usually mean the root canal has failed.
Most people are sore rather than in pain, and that soreness settles within three to five days. Day 1 is numbness followed by tenderness, days 2 and 3 are usually the peak of bite tenderness, and by the end of the first week most people forget the tooth is there. The tooth is not finished healing until a permanent crown or filling goes on, which is a separate appointment with your general dentist.
Weeks, not months. The permanent crown or filling should follow the root canal as soon as your dentist can arrange it, usually within a few weeks. A long delay leaves the tooth sealed only by a temporary filling, which leaks over time and lets bacteria back into the canals, and leaves the hollowed out tooth unsupported. Root fracture is the most common reason root canal treated teeth end up extracted, and a fractured root cannot be repaired.