From Longman Dictionary of Contemporary Englishmouthwashmouth‧wash /ˈmaʊθwɒʃ $ -wɒːʃ, -wɑːʃ/ noun [countable, uncountable] DCBa liquid used to make your mouth smell fresh or to get rid of infection in your mouth
Examples from the Corpus
mouthwash• Alcohol, comic books and mouthwash all bask under the superior reputation of the market.• We saw transparent colas, deodorants, and mouthwashes.• Douches and mouthwashes and birth-control devices.• You can do this by using different after shaves and mouthwashes, and putting different styling products in your hair.• Too much of a hassle to use both toothpaste and mouthwash?• The polymer treatment might be used straight away as a daily mouthwash for mentally handicapped people to stop plaque sticking to teeth.• I got a very bad feeling as we pitched into the bathroom and-fumbled for the mouthwash. 