Could there be a benefit of alcohol in mouthwash?

Antibacterial: Mouthwashes tend to be formulated to help reduce bacterial counts which in turn will help with inflammed tissues.

Sometimes: Alcohol may reduce the harmful bacteria in your mouth. However, it may also dry your mouth out. Obviously there are pros and cons for everything. Ask your own dentist which mouthwash might be best for you, based upon your own particular dental circumstances.