Mouthwash vs. COVID: small study tests if a rinse cuts virus in breath
NCT ID NCT04931004
First seen Jan 30, 2026 · Last updated Jun 21, 2026 · Updated 21 times
Summary
This early study tested whether over-the-counter mouthwash could lower the amount of SARS-CoV-2 virus people breathe out. 34 adults with recent COVID-19 used mouthwash or water, and researchers measured virus in their breath and saliva before and after rinsing. The goal was to see if mouthwash might reduce how much virus spreads into the air, not to treat or prevent illness.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
-
University Hospital
Newark, New Jersey, 07103, United States
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
mouthwash (cetylpyridinium chloride)
What this could lead to
If mouthwash temporarily lowers virus in breath, it might help reduce spread in close-contact settings.
What could go wrong
Very early, tiny study (34 people). Only measures short-term viral load in breath/saliva, not infection or transmission. Mouthwash cannot treat or prevent COVID-19.
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.