I mean, it's in a lot of toothpastes and mouthwashes. Certainly it could be in more things, but dentists do recommend those things it's in (without understanding exactly what makes one better than another, instead going on dentistry-association studies of the observed effects of various products. Presumably the scientists doing said studies know what xylitol is.)
It's hard to just put xylitol in regular foods, though, because people feed random foods to their pets all the time, and xylitol kills dogs. So it only ends up marketed in the form of things you would never think to allow your pets to have in the first place. (Like mouthwash, or gum, or mints.)
You can certainly take your consumption into your own hands, though, and just buy a bag of xylitol to use in place of sucrose for cooking/baking/putting in your coffee/etc. (That is, if you don't have a dog.)