The frontalis muscle is muscle which covers parts of forehead of the skull. Some sources In humans, the frontalis muscle only serves for facial expressions.
The cause is frontalis muscle relaxation, and it is almost always beneficial to the brow component of facial aesthetics. A negative aspect is that frontalis.
It is important to remember that the frontalis muscle is the only levator muscle of the upper face that elevates the brow, eyebrows and skin of the forehead.