The smile may no longer be an effective way, to mask one's true feelings. Some psychologists have claimed that true smiles and false smiles use different muscles. For example, in the true smile, the muscles surrounding eyes tighten, while the cheek muscles pull the corners of the lips upward. On the other hand, in the false smile, the muscles between the eyebrows moves slightly, while the muscles around the mount pull the corners of the lips downward. If the psychologists' claim is proven to be true, perhaps people worry less about what they say, and more about which muscles to use when the smile.
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