Not sure about suicide cyanide teeth, but the pill version was very real. A whole bunch of high-ranking Nazi's left the stage using exactly this. Among them Hit

Not sure about suicide cyanide teeth, but the pill version was very real. A whole bunch of high-ranking Nazi's left the stage using exactly this. Among them Hitler (slightly disputed about whether he simply shot himself right after biting a pill or just shot himself and didn't bother with pill), Himmler (definitely, in front of eyewitnesses shortly after being identified), and Goering while awaiting execution in his jail cell.