Would listerine kill the novel coronavirus in your mouth?

No such studies.: No such studies conducted to evaluate efficacy of listerine. It is mainly a respiratory disease, & involves lungs. Corona Virus involves entire respiratory system from nose to the base of lungs. Using listerine as mouthwash would not carry much benefits

Not therapeutic: Possibly kill some of the virus in your mouth, but not those that have already penetrated the tissues of your eyes, nose, mouth, throat, lungs, etc. Sorry, mouthwash is at best just something to enrich the manufacturer. Wash hands often, keep hands away from face, wear a mask, practice social distancing, stay away from people who don't follow these rules.