Some temporary numbness in any of the areas where bone work is done is an absolute certainty. That could include the scalp, forehead, chin, jaw or even cheek areas depending on where the surgery has been done. This is simply because the flesh is detached from the bony area. Several thousand minor nerves are severed, and it will obviously take some while for those areas to heal. Up to 18 months is not unusual, but less than that is more common.
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