This Russian video shows a high-tech, terrifying in-mouth CNC mill that uses built-in cameras and a machine controlled drill to precisely mill out rotten parts of teeth while you clench the machine's anchor in your jaw, whimpering around it (usefully, it doubles as a gag). (via JWZ)

http://feeds.boingboing.net/~r/boingboing/iBag/~3/_RIRVnmiod8/in-mouth-dental-cnc-mill.html