What uses more muscle a frown or a smile?
I am sure it takes more muscles to frown, than it takes to smile. To be precise, I think a frown uses 54 of our facial muscles, where a smile uses only 14, which directly proves that frowning is a physical activity that burns more calories, and is therefore good for weight loss purposes. Therefore, if you happen to be thin than it is most advisable that you stick to your smiling, and leave the job of frowning to fat people.