Science has proven that smiling creates endorphins. Each time we smile our neurotransmitters release the endorphins throughout our body. Endorphins are proven to help relieve pain and induce feelings of pleasure and euphoria. It’s quite simple, the more we smile, the happier our state of mind will be.
12 Essential Habits You Must Include In Your Daily Routine
Ryan Peck

I was just reading about this a week ago and I swear, it works. Even by yourself without seeing yourself in a mirror , if you smile really big it is very hard to be in or stay in a bad frame of mind. How wonderful it is that simply by smiling , which makes us feel better, others will smile back- sometimes even when they may not feel like it -and we can each have a positive effect on everyone we encounter.We all need to smile more, evidently.