There's a saying that: "It takes 37 muscles to frown. And 22 muscles to smile." However, it's not true. As explained at http://www.snopes.com/science/smile.asp Everyone has heard it a different way, and everyone passes along the version they've heard as rock-solid certainty, presenting same as an indisputable fact of science. Here is a quick sampling of some of ways this saying has been framed, as gleaned from a variety of news articles on any number of topics, including sports, music, and health: One deep-fried-Zen adage advises: "It takes 13 muscles to smile and 33 to frown. Why overwork?" (The Washington Post, 5 December 1982) "You know the old adage that it only takes 10 muscles to smile but it takes 100 to frown," she said. (The New York Times, 19 April 1987) According to doctors we use only four muscles to smile, but when we frown we use 64 muscles — 16 times more. (The Hindu, 11 March 2000) It takes four muscles to smile, 20 to frown and roughly 317 to appear amused when a Celine Dion imitator, who happens to be a man, sings a song about, er, flatulence. (The Denver Post, 29 September 1998) It's easier to smile than to frown. A smile uses 17 muscles, a frown, 43. (Milwaukee Journal Sentinel, 24 February 1997) Right there, you commit to selling to all employees — at cost, not a nickel of markup — company T-shirts that say, "It only takes one muscle to smile and 37 muscles to frown." (St. Louis Post-Dispatch, 24 April 1995) Don't they know it is said you use 35 muscles to frown and four to smile? Why tire yourself? ([Queensland] Sunday Mail, 18 August 1991) Sonny Smith, Auburn's basketball coach, on his dour counterpart at the University of Alabama: ''It takes 15 muscles to smile and 65 muscles to frown. This leads me to believe Wimp Sanderson is suffering from muscle fatigue.'' (The New York Times, 16 December 1986)

depends on how many teeth you have left