Crest’s new “Be” toothpaste line poses an interesting proposition—why can’t you have your toothpaste and eat it, too? Manna to party planners everywhere, these gourmet, flavor-enriched toothpastes beg to be incorporated directly into dishes, making it easy for dinner hosts to entice guests into arriving early and staying late by eliminating the need for lengthy dental-hygiene regimens before and after gala parties.