The following brands of Mouthwash do not contain chometz: Colgate, Crest, Scope, Act, and Oral B.
The following varieties of Listerine are also acceptable: Cool Mint Antiseptic, Cool Mint Zero Alcohol, Fluoride Defense Anti Cavity, Freshburst, Original Antiseptic, Sensitivity Alcohol Free, Total Care Anticavity, Total Care Zero, and Ultra Clean Antiseptic.