How does a Botox Brow lift work?
There are several muscle groups which work to move the brow. There are a set which moves the brows up and a set which moves the brows down. By selectively injecting Botox in the muscles which move the brow down, there is unopposed action of the muscles which move the brow up. Hence – a brow lift.
Tug of war muscles: Botox Lift
In physiology, we term the actions of muscles to be agonist and antagonist muscles. This refers to the results of the muscle contraction.
Certain muscles play “tug-of-war” with areas of the face.
The corner of the mouth: Muscles lift the corner in a forced “cheeky” smile or turn the corner of the mouth downward with frowning.
The outer part of the eyebrow: The squinting muscles pull the eyebrow downwards while the forehead muscles pull it upward.
The central upper lip : “pursing” muscles pull it downward, whereas muscles just to the outside of the nostril create a “gummy” smile.
If we inject the antagonist muscles, the agonist muscle action will predominate and take over. In the examples above:
Injecting Botox to the muscles that pull down the corner of the mouth (the depressor anguili oris) will allow the muscles that lift the corner to take over and minimize down-turning or frowning.
Injecting Botox into the squinting muscles relaxes the pulling down of the brow and creates a chemical “forehead/brow lift”
Injecting Botox in the muscles to the outside of the nostril allows the upper lip to relax and eliminates the gummy look when smiling.
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