Horizontal lines or furrows between the brows are caused by an overactive procerus muscle. Vertical lines between the brows, often referred to as the “11s” are the result of hypertrophic or overly robust corrugator muscles. Treatment with Botox® or Dysport® helps to soften the lines by reducing the activity of these muscles. Both products are FDA approved for this indication. We do not recommend treating the vertical or horizontal lines between the eyebrows with injectable filler.
Horizontal lines across the forehead itself are caused by the frontalis muscle. Overuse of this muscle, sometimes from constantly raising your eyebrows, can make these lines more difficult to treat. Either Botox® or Dysport® can be used to soften and in some cases eliminate transverse forehead lines by decreasing frontalis muscle activity. The FDA has also approved Botox® for use in this area.