Floss once, smile twice.
Meaning: This sentence is saying that flossing your teeth once a day will help you to keep your teeth and gums healthy, which will give you a reason to smile more often.
Choice of Words: Floss is a verb that means to clean between your teeth with a thin string. Once means one time. Smile is a verb that means to show your teeth when you are pleased or amused. Twice means two times. When you put them together, "Floss once, smile twice" means that if you floss your teeth once a day, you will have a reason to smile twice as much.
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