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Many people say that a person’s face and countenance seems to change when they smile. In fact, in many psychological tests, people are more likely to feel better about someone who appears with a smile as opposed to a person who has a neutral expression on their face.

This is because a person is seen as more attractive when they smile. People tend to behave differently around smiling, attractive people. Studies in Penn State University have found that smiling people appear immediately as more trustworthy, relatable, courteous and reliable. People trust you more as it gives you the appearance of sincerity and joy, and people are drawn to these qualities in a person.

Medical studies have reported that when a human sees another smiling face, the area of their brain called the orbitofrontal cortex responds in a way that is a lot similar to receiving a “reward.” People feel good when they see other people happy or smiling, even if they are not the direct cause of them doing so. Furthermore, face research has reported in 2011 that when tested, both men and women were far more likely to gravitate towards images of people who are smiling, as opposed to those who did not.

Smiling is also rather contagious. In the same way that someone with a particularly “infectious” laugh can have other people laughing, a person with a great smile is able to affect others and perhaps induce them to smile as well. Research in Uppsala University in Sweden have even found evidence that frowning at someone who is smiling, while possible, is actually more difficult than just smiling in return at the other person.