It is interesting, my NHS dentist recommended I avoid alcohol-based mouthwash (which is the majority) since it dries out gums and also whitening toothpastes (because they're abrasive by design).

Both things are extremely common on supermarket aisles (even in the UK). But yet dentists suggest you avoid them. That's a rather interesting state of affairs.

Actually my dentist recommended Sensodyne (non-whitening) and a fluoride mouthwash without alcohol (the brand escapes me).