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Submissive grinning, sometimes called smiling, is when a dog pulls up their front lips to expose their teeth (check out a video here and a photo here) and it often occurs during an initial greeting (dog to human, dog to dog).
A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. smile seems to have a favorable influence upon others and makes one likable and more approachable. In the social context, smiling and laughter have different functions in the order of sequence in social situations: