Root canal showdown: bleach vs. chlorhexidine – which hurts less?
NCT ID NCT07453160
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study compares two common root canal cleaning solutions—chlorhexidine and sodium hypochlorite (bleach)—to see which one leads to less pain the day after the procedure. About 90 adults needing a root canal will be randomly assigned to one of the two solutions. Participants will rate their pain 24 hours later using a simple scale. The goal is to help dentists choose the most comfortable option for their patients.
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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 90 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Feb 2026
An estimate. Start dates often move.
- Expected to finish
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Jun 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: Adults aged 18-65 years * Any gender * Requiring non-surgical root canal treatment * Willing to provide written informed consent * Able to report postoperative pain using a validated pain assessment scale - Exclusion Criteria:Known hypersensitivity or allergy to chlorhexidine or sodium hypochlorite * Systemic conditions affecting pain perception (e.g., diabetes with neuropathy, fibromyalgia) * Medications affecting pain perception (e.g., chronic analgesics, corticosteroids, antidepressants) * Preoperative dental pain in the tooth scheduled for treatment * Pregnancy or lactation * Teeth with resorbed roots * Mobile teeth (pathological mobility) * Open apices
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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
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The official record
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A doctor treating you
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