Julia Roberts is famous for the dazzling Hollywood smile which has made her queen of the rom-com. But while Julia Roberts’ toothy smile works for her, it is not advised for everyone. A study has found that people with less lengthy grins(露齿笑), which do not turn up at the corners, are best advised to hide their teeth when smiling. People who smile less broadly risk appearing “contemptuous” if they show their teeth, US researchers found.
Instead, if your grin is smaller, a tight-lipped smile may make you look more genuine and friendly. The findings come from researchers at the University of Minnesota, who quizzed 802 people on their reactions to smiles.
Lead author Dr Nathaniel Helwig said, “The results reveal that no single smile is ‘perfect’ compared to the others. Instead, there exists a ‘smile sweet spot’, which creates successful smiles. Individuals with larger smiles should show larger amounts of teeth, and individuals with limited mouth movement should be encouraged to form closed-mouth smiles.”
It takes only a tenth of a second for a stranger to read your smile, forming a quick judgement on your motives and trustworthiness. The researchers presented participants with people smiling, which they rated from “fake” to genuine and from creepy to pleasant. But, to the authors’ surprise, no one smile was judged to be the most genuine. It requires the right amount of teeth to match someone’s smile length and angle.
A Julia Roberts-style smile was judged as successful in people with larger smiles and a greater angle between their bottom lip and the top of their smile at the far corner. The researchers found a narrow open-mouthed smile which did not turn up at the corners was misunderstood as a sign of “contempt” or “fear” when rated for emotion.
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