Although this U.K. brand is a little harder to get your hands on, it's high on our list thanks to bold, unusual flavors – especially Sicilian Lemon and Fine English Peppermint. Each piece is denser than the American-made xylitol gums, so if you chew gum in part to calm nerves or keep your mouth busy, it's worth ordering a few boxes online. Peppersmith comes in a sleek little box that tucks easily into jacket pockets. [peppersmith.co.uk]