Just like your eyes, it is a window to your soul, efficiently giving people clues about who you are and how you feel. Smiling people appear more confident, are more likely to be promoted, and more likely to be approached. Smiling is also one fun contagious way to live longer as it is also known to relieve stress, boost your immune system, lower your blood pressure, release natural pain killers, and make you more successful. So why not give it the best treatment?