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Close-up of a person's mouth with shiny red lipstick, white teeth, and a tongue licking the inside of the lower teeth.

Close-up of a person's mouth with shiny red lipstick, white teeth, and a tongue licking the inside of the lower teeth.

"A smiling mouth opens approximately 1cm. The tongue tip touches the inside of the lower teeth, then the jaw lowers as the tongue tip descends. During this motion, the smiling lips move inward about 1cm toward the center, maintaining a 1cm gap between upper and lower lips." See more