Root canal relief? study tests weaker bleach for less pain
NCT ID NCT07618182
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study compares two strengths of sodium hypochlorite (a disinfectant used during root canals) to see which causes less pain afterward. 116 adults needing a root canal will be randomly assigned to receive either a 2.5% or 5.25% solution. Pain levels will be measured at 6, 12, 24, and 48 hours after treatment using a simple pain scale.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- sodium hypochlorite
- What this could lead to
- If it works, this could show that a lower concentration of sodium hypochlorite reduces pain after root canal treatment while still cleaning the tooth effectively.
- What could go wrong
- This is a small, early-stage trial with only 116 participants. The results may not apply to everyone, and the difference in pain between the two concentrations might be small or not meaningful.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 116 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jul 2026
An estimate. Start dates often move.
- Expected to finish
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Dec 2026
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Adult patients aged 18-60 years Systemically healthy individuals Permanent teeth with closed apices requiring primary root canal treatment Teeth diagnosed with symptomatic/asymptomatic irreversible pulpitis or pulpal necrosis Patients able to understand the Visual Analog Scale Patients willing to provide informed consent and complete follow-up Exclusion Criteria: * Uncontrolled systemic diseases Pregnant or breastfeeding women Allergy to sodium hypochlorite or local anesthetics Previously endodontically treated teeth Teeth with root resorption, vertical root fracture, or open apex Severe periodontal disease or mobility Use of analgesics, antibiotics, or anti-inflammatory drugs within previous 7 days
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
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