Vertical creases between the brows (glabellar lines) can form as a result of the repetitive contractions in the muscles that control certain facial expressions, such as frowning. Known as “dynamic” wrinkles, these lines and creases may become more prominent over time, making us appear older. Dysport® is an FDA-approved treatment that works by temporarily relaxing the facial muscles that cause wrinkling, much like BOTOX® Cosmetic.