Regular Listerine does contain alcohol, according to the Center for Natural Dentistry. The alcohol is in the mouthwash in order to kill germs and bacteria.
The original product contains approximately 26 percent alcohol, as stated by the Listerine manufacturer. It also has water, menthol and benzoic acid. While the mouthwash does work as an antiseptic, some experts believe that the continued use of it can lead to cancer, since alcohol can dry out the mouth and kill healthy cells. The alcohol content in Listerine is the ingredient that causes a burn felt by many people using it. It should never be given to children.