There are two different types of wrinkles on the face: static wrinkles and dynamic wrinkles. Static wrinkles are present even with complete stillness and a lack of expression on the face. Dynamic wrinkles, on the other hand, are those that appear or become significantly more apparent with the formation of certain facial expressions. BOTOX Cosmetic is ideal for dynamic wrinkles of the face and is used to relax those facial muscles whose excessive action causes wrinkling of the skin. For example, the deep lines between the eyebrows—also known as frown lines—are among the most popular treatment sites for BOTOX.