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Researchers from the University of Minnesota have figured out the features of a winning smile.

  • It's a balance of the mouth's angle, smile width, how many teeth are visible and symmetry. Best bet: showing just a little bit of teeth.
  • Smiles that form slightly asymmetrically were seen as more "genuine" and "pleasant" — to a point. If it happens relatively slowly (longer than 125 milliseconds), the crooked smile just starts to get "creepy."

Why the findings matter:

  • They guide surgeries to reanimate someone's face after a stroke, says author Sofia Lyford-Pike, a facial plastic and reconstructive surgeon at the University of Minnesota. (People who are unable to smile effectively are at increased risk for depression.)
  • It could inform computer graphics.
  • More broadly, the work may help to understand how individual differences in facial expressions can lead to differences in how people perceive threats, trustworthiness and other socially relevant cues, something researchers have long studied.

What they did: The researchers created 3D computer animated faces with slightly different smiles constructed from combinations of different angles of the mouth, varying extents of the smile, how much teeth were showing and how symmetrically the smile formed on the face. 802 people were then asked to rate 250 millisecond-long video clips of the smiles forming for their effectiveness, how genuine they seemed, whether they were "pleasant" or "creepy," and what emotion they thought the smile conveyed. The best-rated smiles have lips angled between 13 and 17 degrees and extend between 55% and 62% of the distance between the eye's pupils.

Two smiles with a combination of (a) smaller and (b) larger mouth angle-smile width combination. Increasing how much teeth are visible led to a more favorable rating of the smile in (b) and a worse rating for (a).Helwig et al. University of Minnesota

Limitation: The study only modeled the mouth. Previous work has found the eyes influence people's perceptions but the study shows the mouth can transmit a lot of information on its own, says Lyford-Pike.

What's next: Determining whether the results translate to spontaneous smiles of different, real people, is a key question, says Aleix Martinez, a cognitive scientist and professor of electrical and computer engineering at Ohio State University. Martinez asks: "Can you predict a person's success (personal, profession) on the "niceness" of their smiles?"

Go deeper

Biden to meet with U.S. financial regulators on Monday

Photo: Drew Angerer via Getty Images

President Biden will meet with financial regulators on Monday.

Driving the news: "The meeting will cover regulatory priorities including climate-related financial risk and agency actions to promote financial inclusion and to responsibly increase access to credit," said press secretary Jen Psaki, according to a press pool report.

Updated 3 hours ago - Economy & Business

The next worker fight: Time off for Juneteenth

Illustration: Annelise Capossela/Axios

Who gets paid time off to celebrate Juneteenth in the years to come will be uneven and complicated, if history is any guide.

Why it matters: Corporate America hasn't grappled with a new federal holiday since Martin Luther King Jr. Day was authorized almost 40 years ago. How they responded took years to evolve.