Product Idea

Since air travelers can't carry toothpaste with them on their carry-ons and since hotels are spotty whether they provide it in your room (U.S. and Korea generally no, Japan generally yes), how about a travel toothbrush with the cleaning/freshening agent built-in to the bristles? It would be good for 4-5 days, by which time the built-in agent is used up and the whole thing thrown away.