Botox®, and the new products Dysport® and Xeomin®, are used to reduce facial wrinkles. They work by blocking a part of the nerve ending that causes muscles to contract, reducing the appearance of dynamic wrinkles. Dynamic wrinkles are those that you see when you squint your eyes and furrow your brow, but relax away when your face is relaxed. Over time, dynamic wrinkles lead to the formation of static wrinkles, which are present whether you are flexing the facial muscles or not. Static wrinkles do not completely disappear with relaxation and are usually treated with facial fillers, dermabrasion, or other more invasive treatments or surgeries.