The first mouthwash on the market was originally sold as floor cleaner. They decided to market it as a mouthwash instead, and invented halitosis to increase sales.
I love Listerine. Love it, love it, love it. I use the stuff around 10-12 times a day and like it in my mouth for around 3 minutes. Then I brush my teeth for about 30 minutes before I spit it out. There is something so intensely addictive about the burn. The only complaint I have is that they can't make it stronger.