Can you end up with a wonky face from jaw shaving??

Hello, I wish to get a jaw shave procedure to make ny lower half of face less masculine and was warned by the surgeon that accidental severing the inferior Alveolar nerves of both sides of face can result in numbness to lip teeth and chin and also a wonky smile!! Is this really true? I thought the marginal mandibular nerve was responsible for smile symmetry? Are they the same thing? Not sure if i should go ahead as I want 7mm of lower bone shaved off.

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