The formation of head-lift lines is mainly due to the long-term vulnerability of the frontalis muscle to contraction by the associated interbrow muscles and frown muscles pulling, and over time, folds or wrinkles tend to appear. In addition, with the growth of age, the frontal muscle gradually aging, it is more likely to form stubborn wrinkles.
In addition, usually such as long time by ultraviolet radiation, have smoking and other bad habits are easy to make the frontal muscle damage, degradation, conducive to the formation of head lines.