It was invented as a disinfectant during the Civil War (US circa 1860s) prior to the invention of sulfa drugs. It does a fair job at killing various germs. The reason why you cannot use knock off listerine is because Listerine is made using a combination of three essential oils, menthol, thymol, eucaliptol. Many strong scented essential oils deterr insects. I just used oregano oil to treat my dogs for fleas. You could see the little buggers run for their lives.
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