Sounds like an urban legend, that last one. . .

Don, my dentist advised against using the mouthwash with alcohol (most of them have it). He said it dries your mouth and can cause gum damage after a while. I was using a mouthwash to soak my orthodontia retainers between cleanings, and after switching to one of the non-alcohol (and more expensive, naturally) ones my mouth felt better.

SRS