That would be an excellent method of 'intense interrogation' at Guantanamo, I would think! It worked wonders on Dustin Hoffman when Lord Laurence Olivier did it to him in "Marathon Man", as I recall!
Gosh, it got quiet today. Where'd everybody go?
Cannot watch the movie for that reason. Leave my mouth and my teeth alone. When a movie has torture concentrated on those areas, it eeries me and then I dream (or nightmare).