The frontalis is a thin sheet of muscles that lifts the eyebrows, located in the forehead. It is the only elevator of the eyebrows in the upper face. It works together with the other muscles of the upper face, the glabella (which create frown lines and depress the eyebrows) to allow facial expression in the upper face.
Treating the forehead lines ALONE is not recommended as doing so typically results in a heaviness in the eyebrows, which can give a hooded look, especially in women.
Women will generally require 8- 20 units of Brand A in the forehead region, depending on the degree of lines and the height of the forehead. Movement will usually return by 6-8 weeks as a small dose is typically used in the forehead to minimise the eyebrow heaviness mentioned above.