A smile can change the world, one face at a time.
Meaning: A smile can make a difference in the world, even if it's just one person at a time.
Choice of Words: Smile is an expression of happiness or joy on a person's face. Can is a modal verb that expresses ability or possibility. Change means to make or become different. World refers to the earth and all its inhabitants. One is a number that represents a single unit. Face is the front part of a person's head. Time is a period during which something happens or exists. When you put them together, the sentence means that a smile can make a difference in the world, even if it's just one person at a time.
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