Alcohol that is not intended for consumption is called denatured alcohol. It contains a toxic chemical that smells bad and is not meant to be ingested. In addition to having a different intended use (solvent, fuel, etc.), a company can avoid higher taxes compared to the alcohol people use for drinking.
The alchol that they use in mouthwash is generally not the same type of alchol that is safe for human consumption. Thymol, Eucalyptol Menthol are some of the types of alchol they use as substitute. Other things in mouthwash, like the large amounts of fluoride can cause gastric distress, nausea and other issues when consumed. The few people that do drink mouthwash as a substitute are usually recovering alcoholics trying to get a buzz.
Edit. Most mouthwashes still contain ethanol and thus can still have the alcholic effect. The Thymol, Eucalyptol, and menthol are also added.
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