The inability to squeeze every last bit of toothpaste out of a tube is the subject of frequent consumer complaints, yet the format endures. Enter a simple concept: two-way toothpaste. The double-sided tube makes it easier to fully dispense the paste. It also solves a problem for fastidious types who get angry with their bathroom buddies for squeezing toothpaste from the front of the tube. (Concept: Dominic Wilcox,