We’ve all heard that smiling makes us feel better, but the science behind this simple facial expression reveals something far more profound. Your smile isn’t just a social courtesy—it’s a complex biological phenomenon that can literally reshape your health from the inside out. The Biochemistry of a Smile When you smile, your brain doesn’t just register happiness—it triggers a cascade of chemical reactions that would make any pharmaceutical company envious. The simple act of moving your facial muscles into a…