Psychological researchers show the correlation of smile with the happy state of mind and heart. Smiles are more complicated than the simple communication of happiness. They can communicate a wide range of positive emotions, depending upon their specific makeup. To further point out the researchers, they say an average adult smiles only 20 times a day whereas a happy adult smiles 40-45 times a day. In the difference lies the verity, the verity of confidence, innate ability and competence of a human being. A study has confirmed what we already know - That a white and evenly spaced set of teeth makes people look more attractive. And, it has also explained the reason. It is because teeth are the human equivalent of a peacock’s tail - A sign of health and genetic quality designed to help choose a mate. And thus not to skip, is the kinship of smile and medical sciences. Smile has the ability to regulate our blood pressure, immune system, lower the risk of cancer. It increases our life span by seven years and provides inner peace and satisfaction.