How many times have you smiled today? If you’re an average adult, you’ll smile 20 times today. If you’re a really happy adult, you’ll smile 40-50 times today. That sounds decent, until you compare it to the number of smiles a child expresses each day: 400! Why do we smile and how does it affect our brain? Here’s the sequence of events: You feel happyYour brain sends a signal to cranial nerve VII, which then triggers the face’s zygomaticus major