A tooth paste tube theory

I have a theory about tooth paste. Do you want to hear it? If so, read on.

You can never run out of tooth paste. There is always some left in the tube, enough to satisfactory brush your teeth (in a pinch). Sure, the work needed to extract the toothpaste increases as the volume of remaining paste decreases, and at some point it simply gets easier to walk to the store and buy a new tube of your personal favourite than to, say, rent a bulldozer to squeeze some out on your tooth brush. I also think the neighbours would be rather annoyed if I started a dozer in my apartment at 6:40 in the morning...