What are women's perspectives on seeing a man with a nice smile?

I hear various conflicting elements when it comes to what women like. Some women like serious men and some women love a nice smile on a man. So In all respect ladies if you looked at a wall of men faces what would you prefer a nice smile or a blank face with no emotion whatsoever.
SMile on a man or no smile what do you like to see on a man?

What are women's perspectives on seeing a man with a nice smile?
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