It shouldn't be seen unless maybe you have double-sided polygons turned on. In the Surface Editor at the bottom there is the Smoothing option and right under it is double-sided option. Do you have it enabled? If you do then you should turn it off.
Another thing are the polygons in the back of the head facing the right way? Can you seen them in Modeler or do they look as if they aren't there?
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Johnny was a chemist's son, but Johnny is no more.
What Johnny thought was H2O was H2SO4.
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