Toothpaste Roll

Got this cute little widget recently as "service" when I bought a package of batteries. As an electrical engineer, I feel it is my responsibility to have plenty of batteries on-hand. It took me awhile to figure out what exactly this device was. The package was all in Korean, and being attached to a pack of batteries, and having a battery-like shape, using it with toothpaste was not exactly the first thing that crossed my mind. Finally I recognized the Korean word for teeth and figured it out. This dandy device hangs in my shower now (it came with a suction cup hook):