The vertical "11" lines between the eyebrows, also known as glabellar lines or frown lines, are caused by repeated contraction of the corrugator supercilii and procerus muscles during expressions such as frowning, concentrating, or squinting.

 

Over time, these dynamic lines can become etched into the skin, making them visible even when the face is relaxed and contributing to an appearance that may be perceived as tired, stressed, or stern. Botulinum toxin treatment temporarily relaxes these muscles, softening existing lines while helping to prevent them from becoming deeper.

​

Careful assessment and precise injection technique preserve natural facial expression while creating a smoother, more approachable, and refreshed appearance rather than a frozen look.