1 Area Anti Wrinkle
A wrinkle in the skin is typically formed perpendicular to a contracting muscle located directly beneath it. For example, the muscle in the forehead is a vertical muscle, and when it contracts (such as when you raise your eyebrows), the lines that form (wrinkles) will be horizontal.
Likewise, the two muscles that are responsible for the frown lines are positioned slightly horizontally between the eyebrows, so when they contract, the frown lines appear vertical.
Botox is injected into muscles, where it blocks nerve impulses to those tissues. The muscle activity that causes the frown lines is reduced, and a smoother look results. Without a contracting muscle beneath it, the skin has a difficult time wrinkling.
Botox is priced per area and there are usually 3 area's in total:
AREA 1 - Frontalis Muscle which treats the horizontal frown lines on the forehead.
AREA 2 - Glabella which treats the vertical lines in the eyebrows.
AREA 3 - Orbicularis oculi muscles which treat the crows feet surrounding the eyes.