It communicates happiness and acceptance. It is that one thing that connects and brings together us all. Not only can smiling make you more attractive it can also make you look younger, people often tend to like people who smile and laugh a lot more. The muscles we use to smile also lifts up the face, which also makes people look younger and feel younger. So overthinking, just try smiling your way through the day so that you'll look younger and spread positivity to the people around you.