Cardiff University psychologists have come up with a striking truth that says that botox treatment can lead to depression. According to the team of experts, Botulinum toxin, curbs the strength of eye muscles.

These eye muscles are significant in smiling. The team came across the fact after tracking 25 people and tried to understand their perception of facial surgery. It was found through experiment that reducing wrinkles by using injections of Botulinum toxin A can simply transform the way you smile and perceive the world.

The main focus of the study included psychological impact of erasing frown lines on people's foreheads with this procedure. According to the researchers, "It's called facial feedback. The expressions we make on our face are connected to the emotions we feel".

After hearing from the participants, they were made aware of the fact that facial feedback has an impact on Botox treatment of crows' feet or laughter lines around the eyes. All those who have gone for the treatment have reduced strength of smile and are less happy.

The results of experiment would be presented by Dr. Michael Lewis, reader at the school of psychology in Cardiff. The place that has been fixed for the same is British Psychological Society's annual conference in Harrogate.