Facial Implants

Good day, Dr. Garcia. Last week I had a chin implant trimmed through a small submental incision. Since then, my speech has been noticeably impaired. How likely is it that my surgeon damaged the mentalis nerve in this procedure? He tells me it's just swollen, but it feels quite different to me than it did before the surgery, like my chin is in vise. Oddly, and unexplainably, my upper lip is also numb. What do you think is going on? Thank you for your time and care.