Buccal Branch Nerve Damage?

How does buccal branch nerve injury recover, if it gets better at 6-12 weeks does it completely resolve or does it just show improvement and then take more time to completely resolve? I will be going to a neurologist to test it with emg. If it does completely recover can it leave behind some sagging,currently my lip and cheek are sagging on the injured side, when I talk and smile not broadly my teeth are covered on the injured side,but if I smile broadly it looks normal, what is going on?Stressed

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