Smile mask syndrome
Psychological disorder proposed by professor Makoto Natsume / From Wikipedia, the free encyclopedia
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Smile mask syndrome (Japanese: スマイル仮面症候群, Hepburn: sumairu kamen shōkōgun), abbreviated SMS, is a psychological disorder proposed by professor Makoto Natsume [ja] of Osaka Shoin Women's University, in which subjects develop depression and physical illness as a result of prolonged, unnatural smiling.[1]