What is the rarest smile?

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The rarest smile type is the complex smile, with only an estimated 2% of the population possessing this smile. This smile is rare because it requires three muscle groups to work simultaneously when smiling.

anonymous · Answer 1

The rarest smile type is the complex smile, with only an estimated 2% of the population possessing this smile. This smile is rare because it requires three muscle groups to work simultaneously when smiling.

What is the rarest smile?

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What is the rarest smile?

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1 Answer

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