Each time you smile your brain feels really happy. Smiling activates the release of feel-good-messengers that work towards fighting stress. These messengers help you experience a whole range of emotions, from happiness to sadness, anger to depression. 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. Endorphins are natural painkillers - 100% naturally produced by your own body, without the negative effects of medication. (www.neuronation.com)