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In vitro study shows mouthwash component has antiviral effect against SARS-CoV2. However that is a long way away from any clinical use if ever.
Medical Mythbusting Commentary for October 7, 2022 Source:Mouthwashes may suppress SARS-CoV-2 Reference:Antiviral effect of cetylpyridinium chloride in mouthwash on SARS-CoV-2