Muscles works in both cases but it’s seems difficult to understand that how they work

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    $\begingroup$ I'm voting to close this question as off-topic because it is Guinness Book of Records stuff and not science. $\endgroup$ – David Nov 13 '18 at 20:28
  • $\begingroup$ This is quite a common topic on popular science websites and usually comes to the conclusion that smiling requires more muscles than frowning. See this one as an example that includes some reasoning for the numbers stated: science.howstuffworks.com/life/inside-the-mind/emotions/… $\endgroup$ – Armatus Nov 17 '18 at 7:53
  • $\begingroup$ I don't consider this a bad question or off-topic per se, but in its current state it shows no evidence of some basic research of your own. Please have a look and be more specific about what's hard to understand. $\endgroup$ – Armatus Nov 17 '18 at 7:57

The expression of emotion is a complex thing and the answer to this is somewhat dependent on the variation within the individual. There are a little over 40 muscles in the human face, including the orbicularis oris (muscle around your mouth), the risorius (that pulls the corners of the mouth backwards) and the temporalis (the mouth muscle used for chewing). Due to the complexity of these muscles and those that contribute to a smile or sad face, there is likely quite a bit of variation in the muscles that are required for each. I have heard however that it takes approximately 43 muscles to frown and 17 to smile, which may make sense given the fact that a smile is only a slight deviation from a "resting" facial expression.

Hope this helps!


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