Wrinkle lines exist due to repetitive muscle movements. These lines can be static (lines that remain after the muscle relaxes and deepens with age) or dynamic (lines that exist only when expressing emotions and fades after). Wrinkle injection involves the use of active ingredient Botulinum Toxin that is injected into a muscle that causes temporary muscle paralysis. This is what softens the wrinkle lines and creates a more youthful appearance. BOTOX® is one of the most well-known brands, others include BOCOUTURE®, Azzalure® and Dysport®.