smile more often to feel happier, suggests a new research. Botox, used to fight facial wrinkles, is made of an extremely toxic protein called Botulinum toxin that temporarily paralyses the muscles that cause creases. So, your face looks frozen if you don’t have facial expressions at all.
Now the lack of facial expressions may influence emotional experiences as well, the research found. Which means, that being unable to smile when you are happy feeds back to the brain reducing the intensity of feeling. 
"With Botox, a person can respond otherwise normally to an emotional event, [such as] a sad movie scene, but will have less movement in the facial muscles that have been injected, and therefore less feedback to the brain about such facial expressivity," The Telegraph quoted researcher Joshua Davis, a psychologist at Barnard College in New York, as saying.
In a before-and-after experiment, researchers noted the facial expressions and emotional experiences of some patients who were injected with Botox and found that they exhibited an overall significant decrease in the strength of emotional experience.
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