"Tooth whitener" refers to a product or procedure that helps make your teeth look whiter and brighter by removing stains and discoloration from the surface of your teeth. Full definition
If you don't want to try this way or are allergic to strawberries, activated charcoal makes a great natural tooth whitener too. (wellnessmama.com)
FYI - this same exact fake blog scam is being used in all sorts of categories online now from teeth whiteners (ever seen the stupid «Cathy's Teeth» ads everywhere?) (truthaboutabs.com)
He went to his local Target and couldn't find any duds worth buying, so he went home with teeth whitener instead. (nreionline.com)