Advantages of smiling:

1) Improve mood

When you smile, your brain releases tiny molecules called neuropeptides to help fight off stress. Then other neurotransmitters like dopamine, serotonin and endorphins come into play too. The endorphins act as a mild pain reliever, whereas the serotonin is an antidepressant.

2) stress reliver

The endorphins act as a mild pain reliever, whereas the serotonin is an antidepressant. One study even suggests that smiling can help us recover faster from stress and reduce our heart rate. In fact, it might even be worth your while to fake a smile and see where it gets you.

3) better relationships

That's a very scientific way of saying that you feel happy and relaxed. As such, you are more pleasant to be around and you allow your partner to feel happy and relaxed, rather than stressed out about what's bothering you.

4) younger appearance

Smiling reduces stress and makes you feel more positive. More to the point, researchers found that people who smile are often perceived as being younger than their actual age, while people who frown appear to be older than they really are. So, turn that frown upside down and put on a happy face

5) lower blood pressure

When a smile flashes across your face; dopamine, endorphins and serotonin are all released into your bloodstream, making not only your body relax but also work to lower your heart rate and blood pressure.

6) makes us attractive

We are naturally drawn to people who smile. There is a real physical attraction factor linked to the act of smiling. Not surprisingly, more severe or negative facial expressions like frowns, scowls, and grimaces actually work in the opposite manner, effectively pushing people away.