The Afthead family has a secret, and as a family of scientists and engineers you need know know we are a trustworthy source of this information.  Toothpaste is magically regenerating.  If you squeeze the tube hard enough each toothpaste molecules will split and create two toothpaste molecules.  Do this enough and you will never run out of toothpaste.  You can only really get enough force out of the squeeze when the toothpaste is almost empty, and, of course, even if you did squeeze the tube hard enough when it’s full you are just going to end up with toothpaste all over.  But when you get to the end just keep squeezing.  If you don’t you will be shamed and labeled a heretic for not believing in the magical toothpaste properties.

(I did not throw this tube away, but Mr. Afthead did.  I’m so disappointed in him.)