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Dynamic properties of successful smiles

Fig 1

The 27 different smiling faces.

The 27 smiles represent all possible combinations of the three spatial factors (mouth angle, smile extent, dental show) at three different levels (low, medium, high). The numbers 1–27 have been included post hoc for labelling purposes and were not present in the animations.

Fig 1

doi: https://doi.org/10.1371/journal.pone.0179708.g001