it's like a small paper mint you put it in your mouth to refresh your breath.

There are many different kinds that were out in the past year or so. The ones most heavily advertised (that I can remember) were the Listerine Pocket Packs IIRC. I think that was them

Listerine Strips are insane! I nearly cried...

Don't buy the Listerine. Last I checked they were three times the price of a pack of gum and thirteen times smaller.
That and it tastes more like paper than mint.

maybe they ran out of listorine and thought that paper had menthol in it? but yeah, it does taste like paper.