Cochrane review (2022)
Systematic review47 studies and 5805 participants. No difference in healing-related outcomes; a higher chance of pain in the first week after single-visit treatment.
Clinical Pathway
Single-Visit vs Multiple-Visit Root Canal
Some root canals are completed in one appointment and others over two or more. The current evidence does not show a healing advantage for either approach; healing and success are generally comparable, while the visit plan is chosen for the specific tooth.
Healing generally comparableSlightly more early pain (single)Clinician-led decision
Last updated: June 4, 2026
What single- vs multiple-visit means
In a single-visit root canal, cleaning, shaping, and filling (obturation) of the canals are completed in one appointment. In a multiple-visit approach, the tooth is cleaned and shaped at the first appointment and, after an intracanal medicament is placed and the tooth is temporarily sealed, the filling is completed at a later visit. Both are accepted ways to carry out treatment.
The current evidence does not show a healing or success advantage for either single-visit or multiple-visit treatment; the outcomes are generally comparable. Single-visit treatment may be associated with a higher chance of pain in the first week, while evidence on flare-up is limited and mixed. The choice is generally guided by the specific tooth, time and convenience, and clinician judgment rather than a clear outcome advantage of one approach.
What the evidence shows
The largest synthesis is a Cochrane systematic review (Mergoni et al., 2022; 47 studies, 5805 participants), supported by earlier systematic reviews. Across these, the two approaches generally perform similarly for healing, with a difference seen mainly in short-term pain.
Healing and success
- No evidence of a difference in radiological failure at one year or more (RR 0.93; moderate-certainty evidence) and no evidence of a difference in tooth extraction (very low certainty) — Cochrane 2022.
- An earlier meta-analysis of three randomized trials in teeth with apical periodontitis found single-visit treatment had an approximately 6.3% higher healing rate, which was not statistically significant (P=0.38) — Sathorn et al. 2005.
- Taken together, healing and success are generally considered comparable between the two approaches.
Short-term pain
- A higher proportion of patients reported pain within the first week after single-visit treatment (RR 1.55; moderate-certainty evidence) — Cochrane 2022.
- There was no evidence of a difference in pain measured shortly after filling or in analgesic use — Cochrane 2022.
- An earlier review of 16 studies reported postoperative pain ranging widely (about 3% to 58%) with too much variation to pool, and found no compelling difference between approaches — Sathorn et al. 2007.
Flare-up and swelling
- No evidence of a difference in swelling or flare-up was found, though the certainty was very low — Cochrane 2022.
- A separate meta-analysis suggested flare-up might be more frequent after single-visit treatment (RR 2.13), but the authors graded this as very weak evidence — Schwendicke & Göstemeyer 2017.
- Because the flare-up evidence is limited and mixed, it is interpreted cautiously and does not by itself favor one approach.
Healing meta-analysis (2005)
Meta-analysisThree randomized trials in teeth with apical periodontitis. A small healing difference favoring single-visit that was not statistically significant.
Pain/flare-up review (2007)
Systematic reviewSixteen studies. Wide variation in postoperative pain and no compelling difference between approaches.
Complications review (2017)
Meta-analysisTwenty-nine trials. No difference in complications or pain; a possible but very weak signal of more flare-up after single-visit.
Where each approach may fit
The points below describe situations where each approach may fit and the considerations a clinician weighs. They are not a self-selection tool, and they do not imply one approach has an outcome advantage.
01Single-visitStraightforward cases with adequate appointment time and good isolation; often vital teeth; when fewer appointments suit the patient and clinician.
01Single-visitStraightforward cases with adequate appointment time and good isolation; often vital teeth; when fewer appointments suit the patient and clinician.
Situations where it may fit
Straightforward cases with adequate appointment time and good isolation; often vital teeth; when fewer appointments suit the patient and clinician.
Considerations
Healing is generally comparable to multiple visits. There may be a higher chance of pain in the first week. Requires enough time to complete cleaning, shaping, and filling well in one sitting.
02Multiple-visitMay be considered for necrotic teeth with a periapical lesion, persistent exudate or symptoms, complex anatomy, or when an intracanal medicament between visits is judged useful.
02Multiple-visitMay be considered for necrotic teeth with a periapical lesion, persistent exudate or symptoms, complex anatomy, or when an intracanal medicament between visits is judged useful.
Situations where it may fit
May be considered for necrotic teeth with a periapical lesion, persistent exudate or symptoms, complex anatomy, or when an intracanal medicament between visits is judged useful.
Considerations
Allows an interappointment medicament and reassessment, though evidence is not definitive that this improves the final outcome. Involves an additional appointment and a temporary restoration between visits.
| Approach | Situations where it may fit | Considerations |
|---|---|---|
| Single-visit | Straightforward cases with adequate appointment time and good isolation; often vital teeth; when fewer appointments suit the patient and clinician. | Healing is generally comparable to multiple visits. There may be a higher chance of pain in the first week. Requires enough time to complete cleaning, shaping, and filling well in one sitting. |
| Multiple-visit | May be considered for necrotic teeth with a periapical lesion, persistent exudate or symptoms, complex anatomy, or when an intracanal medicament between visits is judged useful. | Allows an interappointment medicament and reassessment, though evidence is not definitive that this improves the final outcome. Involves an additional appointment and a temporary restoration between visits. |
How the decision is generally made
Because outcomes are generally comparable, the visit plan is a clinical decision for the specific tooth rather than a fixed rule or a patient self-diagnosis. A clinician typically weighs several factors together.
Factors a clinician may consider
- Case complexity and canal anatomy, including curvature and accessibility.
- Whether the pulp is vital or necrotic, and whether a periapical lesion is present.
- Presence of persistent drainage, exudate, or symptoms that may favor reassessment at a later visit.
- Adequate appointment time and reliable isolation (rubber dam) to complete treatment well.
- Patient preference and convenience, including travel and the number of appointments.
Some reviews suggest multiple visits might be preferred for certain teeth, such as those with a periapical lesion, but the evidence for a final-outcome advantage is not definitive. The decision is individualized.
Frequently asked questions
01Is a single-visit root canal safe?
01
Is a single-visit root canal safe?
Short answer
Single-visit root canal treatment is a widely accepted approach.
- 01Systematic-review evidence shows healing and success are generally comparable to multiple-visit treatment.
- 02Whether it is suitable for a particular tooth is a clinical decision that depends on the case.
02Does a single-visit root canal hurt more?
02
Does a single-visit root canal hurt more?
Short answer
There may be a higher chance of pain in the first week after a single-visit root canal, based on moderate-certainty evidence.
- 01Any difference is generally short-term, and there was no clear difference in pain measured shortly after the filling or in painkiller use.
03How many visits does a root canal take?
03
How many visits does a root canal take?
Short answer
A root canal may be completed in one appointment or over two or more, depending on the tooth and the clinical situation.
- 01The number of visits is decided by the treating dentist or endodontist rather than by a fixed rule.
04Is one approach more successful than the other?
04
Is one approach more successful than the other?
Short answer
The current evidence does not show a healing or success advantage for either single-visit or multiple-visit treatment; the outcomes are generally comparable.
- 01The main difference reported is a slightly higher chance of short-term pain with single-visit treatment.
05When might multiple visits be chosen?
05
When might multiple visits be chosen?
Short answer
Multiple visits may be considered for necrotic teeth with a periapical lesion, persistent drainage or symptoms, complex anatomy, or when an intracanal medicament between visits is judged useful.
- 01The evidence that this improves the final outcome is not definitive, so the choice is individualized.
06Can I choose single-visit treatment?
06
Can I choose single-visit treatment?
Short answer
Patient preference and convenience are generally part of the discussion, and many clinicians consider them.
- 01The final visit plan, however, depends on the specific tooth and is decided together with the treating clinician.
Continue reading
Related EndoGuide pages
References
- Mergoni G, Ganim M, Lodi G, Figini L, Gagliani M, Manfredi M. Single versus multiple visits for endodontic treatment of permanent teeth. Cochrane Database Syst Rev. 2022;12(12):CD005296.
- Sathorn C, Parashos P, Messer H. Effectiveness of single- versus multiple-visit endodontic treatment of teeth with apical periodontitis: a systematic review and meta-analysis. Int Endod J. 2005;38(6):347-55.
- Sathorn C, Parashos P, Messer H. The prevalence of postoperative pain and flare-up in single- and multiple-visit endodontic treatment: a systematic review. Int Endod J. 2008;41(2):91-9.
- Schwendicke F, Göstemeyer G. Single-visit or multiple-visit root canal treatment: systematic review, meta-analysis and trial sequential analysis. BMJ Open. 2017;7(2):e013115.
Disclaimer
This information is for educational purposes only and is not a diagnosis. The number of visits for a specific tooth is a clinical decision made by the treating dentist or endodontist. Seek prompt dental evaluation for worsening pain, swelling, fever, or difficulty swallowing or breathing.
LY
Reviewed by
Dr. Levent Yuksel
DDS · Endodontist
Independently authored and clinically reviewed.