Arguably, the only inconvenience related to mouthwash use is the sting. Some can’t stand the burning sensation whenever they wash their mouth with a generous helping. While no-sting formulas in the market exist, the burning sensation is often considered a sign of the mouthwash's effectiveness.
The dental community is divided as to what causes the burning sensation with every swish or gargle with the mouthwash. According to BreathMD.com, the alcohol content is to blame. This is the more common argument where some mouthwash brands contain up to 30 percent alcohol. As a desiccant, alcohol dries up the mouth, leaving it prone to the slightly bothersome sting.