With the Pursonic S1 Portable UV Toothbrush Sanitizer ($11), I can finally trust that my toothbrush is keeping clean throughout my many adventures. This carrying case is advertised to kill 99.9 percent of the germs and bacteria on your toothbrush thanks to ultraviolet light bulbs. Just pop your toothbrush in, and the light turns on for five minutes — the device should turn off on its own once the time is up.