Teeth.
These pictures speak for themselves. The words of Murray Dickson ("Where there is no doctor", 1983), that you can read here, contain some truths about basic principals for mantaining healthy gums and teeth. It's always easiest to solve a problem by preventing it from becoming one.
I've been reading the book during this fall and I am amazed of its way to bring what seems to be great and simple solutions to people in different places of the world.
