Frowning takes the most muscles to complete.
frownin
The facial nerve (cranial nerve VII) is responsible for controlling muscles that enable movements such as frowning. It innervates the muscles of facial expression, including those involved in facial emotions like frowning.
producing a facial expression
Frowningchewing requires most chewing requires most
empathy
Smiling uses the most facial muscles.
frowning
the face
Some of the most visible effects of facial wasting is that the muscles in the face are slowly degraded. Facial wasting is a side medical issues that stems from person having another disease, such as HIV. As the disease progresses, it attacks muscles within the body and slowly eats them away.
frown
No she was happy she just didn't have as big as a smile as most people.