As we age, repeated muscle movements such as frowning, squinting, smiling and grimacing all leave their mark on our faces. Dynamic wrinkles tend to form over time and can be accentuated when we express emotion. 

Botulinum toxin may be used to relax the muscles involved in the formation of dynamic wrinkles. Common uses include temporary improvement in the appearance of moderate to severe glabellar lines visible when frowning. Botulinum toxin is also used in lateral canthal lines (crow´s feet lines) visible when smiling.