Dynamic wrinkles are caused by contractions of the delicate underlying facial muscles every time you smile, laugh or frown. The more emotion you show, the deeper these wrinkles and lines are likely to be. While you may have earned every one of your worry lines, you don’t have to show them anymore. Now, thanks to a new use for an approved drug, dynamic lines can be dramatically softened. The procedure known as cosmetic denervation uses BOTOX® injections to improve the appearance.