The Teeth position would cause the zygomaticus major or the risorius muscle, resulting in a smile.
2.
In contrast, a consciously contrived smile involves only the risorius muscles and pulls the lips sideways, but not upward.
3.
It is contributed to by the following muscles : orbicularis oris, buccinator, levator anguli oris, depressor anguli oris, zygomaticus major, risorius, platysma, levator labii superioris.
4.
In its course over the face, it is covered by the integument, the fat of the cheek, and, near the angle of the mouth, by the platysma, risorius, and zygomaticus major.
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