How many nerves to make a smile?

Answer 1

All muscles of facial expression are supplied by seventh cranial nerve. That is Facial nerve. This nerve carries the taste sensation from anterior two third of the tongue also.

Answer 2

It takes 43 muscles to form a smile, but there are too many nerves involved to provide an exact number. The facial muscles are innervated by the facial nerve (CN VII), which branches out into numerous smaller nerves that control specific movements in the face.