Single vs Multiple Visit RCT: Does It Affect Post-Operative Pain?

One of the most common clinical questions in endodontics is still a very practical one:

Should I complete the root canal in one visit or multiple visits — and will it change post-operative pain?

A recent umbrella review brings together evidence from multiple systematic reviews to look at this question more clearly.

The review included 12 systematic reviews comparing single-visit and multiple-visit root canal treatment in permanent teeth.

Post-operative pain was assessed in most studies using:

• Visual analogue scales (VAS)

• Numeric rating scales (NRS)

Some studies also looked at pain incidence and flare-ups, although definitions and reporting of these outcomes varied significantly.

The methodological quality of the included reviews was assessed using established tools (AMSTAR 2 and ROBIS), and overlap between primary studies was also considered.

Across the higher-quality reviews, the findings were consistent:

There was no clear or clinically meaningful difference in post-operative pain between single-visit and multiple-visit root canal treatment.

This applied across different time intervals and outcome measures.

Flare-up data were less consistent, mainly because of variability in how flare-ups were defined and reported across studies.

From a chairside perspective, the takeaway is straightforward.

If the concern is post-operative pain alone, current evidence does not strongly support choosing one protocol over the other.

In other words:

Completing treatment in a single visit does not appear to increase pain.Spacing treatment over multiple visits does not appear to reduce it in a clinically significant way.

The review also highlights some limitations:

• Variability in how pain was measured

• Differences in follow-up time points

• Inconsistent definitions of flare-ups

• Overlap of the same primary studies across multiple reviews

These factors reduce the certainty of the conclusions, even though the overall direction of evidence remains similar.

Since post-operative pain does not appear to differ meaningfully between the two approaches, the decision can be guided by other clinical factors:

• Case complexity

• Presence of infection or exudate

• Patient symptoms

• Time and scheduling considerations

• Patient preference

For example, a straightforward vital case may be suitable for a single visit, while a complex infected case may still benefit from multiple visits depending on clinical judgment.

The single-visit vs multiple-visit debate has been ongoing for years. This review suggests that, at least in terms of post-operative pain, the difference may not be as significant as once thought.

The focus, therefore, shifts back to fundamentals — diagnosis, case selection, and execution.

Because in endodontics, outcomes are influenced less by the number of visits and more by how well the treatment is performed.

Pain evidence should not determine visit number alone

Umbrella reviews can summarise several systematic reviews, but overlap in primary trials and differences in diagnosis, pain definitions, analgesic use and timing may reduce certainty. A small average pain difference may not be clinically important. Visit strategy should still follow canal status, symptoms, drainage, anatomy, time, procedural events and the ability to establish a secure seal.

Read alongside clinical visit selection, weeping-canal management and NiTi instrumentation evidence.

Frequently asked questions

Does one visit always cause less pain?

No. Evidence varies, and diagnosis, technique, baseline pain and outcome timing influence results.

Should postoperative pain decide the treatment schedule?

It is one consideration among biological, procedural and patient factors.

What should patients be told?

Explain that temporary discomfort is possible, provide safety-net advice and identify symptoms needing review.