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Are you using PeopleMaker as part of your workflow? If so, can you not select the mouth portion within PeopleMaker and select "Flip polygon order" to make the mouth visible?
If that doesn't work, try applying a .disable(viz.CULL_FACE) method to your face object from the Vizard script. This will disable backface culling over the whole face making all polys always visible.
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