A smile is an inexpensive way to change your looks.

The line treats a smile as a kind of “low-cost” self-transformation: without money, cosmetics, or status, a person can immediately alter how they appear to others. It also implies that attractiveness is not only a matter of fixed features but of expression and social signal—warmth, openness, and ease. By calling it “inexpensive,” the quote frames kindness and approachability as accessible choices rather than luxuries, subtly critiquing the idea that improving one’s appearance must be purchased. Its appeal lies in its practical optimism: small, voluntary gestures can reshape first impressions and interpersonal atmosphere.