Floss now, smile later.
Meaning: This sentence is saying that flossing your teeth now will help you to keep your teeth and gums healthy, which will give you a reason to smile more often in the future.
Choice of Words: Floss is a verb that means to clean between your teeth with a thin string. Now means at the present time. Smile is a verb that means to show your teeth when you are pleased or amused. Later means at a time after the present. When you put them together, "Floss now, smile later" means that if you floss your teeth now, you will have a reason to smile later.
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Related Expressions