Ok, every toothbrush is theoretically a pocket toothbrush, but the OHSO Pocket Toothbrush is different - because it also packs in the toothpaste.
Looking like a pen (and ideal to clip into your inside pocket), the OHSO holds your toothpaste in the handle, with a window showing how much you have left. Turn the knob clockwise and the toothpaste is pushed onto the bristle head - you are them ready to brush.
You can use any toothpaste, but the nozzle is apparently "Colgate friendly". A universal adaptor will cater for all others. Available online, you can pick one up for $19.99 (around £10).
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From: Final Fantasy XIII 's Motomu Toriyama and Yoshinori Kitase - Interview