Botox can cause the eyebrows to drop in position especially if too much is injected into the elevators of the forehead. The balance in eyebrow position depends on precise administration of botox into the depressors and elevators of the forehead. If too much botox is placed into the muscles that elevate the forehead, then the net result is a downward or heavy position to the eyebrows often creating the look of a heavy upper eyelid. The opposite can be done if too much botox is placed into the depressors of the eyebrow and the net result can be a surprised or sinister appearing eyebrow. Both can be remedied either by allowing the botox to wear off or by administering additional amounts to the opposite muscles to reverse the downward or upward pull of the eyebrow muscles. This is kind of like a "see-saw" and if one person weighs much more than the other the see saw will land on that side.
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