Image by Medgadget
Don’t you hate it when you go to the dentist and he asks you a question.
But you can’t answer because one of his tools is deep in your mouth.
Above we can see a 1939 dental tool come torture device called a “gnathograph”, and it’s designed to measure how your teeth are set so a dentist can fit a crown, straighten a rogue tooth and so on.
Thankfully, dentistry has moved on from such primitive tools, or has it?