Facial muscle atrophy caused by facial nerve injury caused by tooth extraction generally does not occur. Now the meat between the cheekbone and the mandibular masseter is gone, and the face is sunken. The reason is not clear. Do evoked potentials, electromyography, three and a half, and you can definitely see if the facial nerve is damaged, but your photo doesn't look like it is damaged. Doing electromyography will be good for your diagnosis.

(Dr. Song Weiming solemnly reminds me that because I can't see the patient face to face, I can't fully understand the condition. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )

Badachu Plastic Surgery Hospital Song Weiming/