From its homepage:

Flix is the professional “In-Between” stick. Use it in between your teeth, in between morning and evening brushings, in between those great meals you have with friends, in between important business meetings, and in between close encounters, when bad breath can impede your progress. You know what we mean, don’t you?

Cheers, updated the description so you don’t have to go searching although it’s pretty much a toothpick on steroids.