Question

the force that brings changes in the face while smiling is​

Answer 1

Answer:

Neurotransmitters are activated which bring the change in facial expressions.

Answer 2

Explanation:

neurotransmitters called endorphins are released when you smile . these are triggered by the movement of the muscles in your face which is interpreted by your brain which in turn release this chemicals endorphins is responsible for making us feel happy and they also help lower stress level