A brow lift involves surgically lifting the position of the brows. Gravity and aging can cause the eyebrows to sag. Sometimes the sagging is not equal, leaving some people with uneven eyebrows. A brow lift will return the eyebrows to a higher position, offering a younger, less tired-looking appearance. In the case of uneven eyebrows, a brow lift can also even out the difference between the two sides to offer better symmetry.