There could be another less sinister, but excruciatingly painful answer that fits with the numb chin too -
I've had trouble past with what turned out to be a recurring infection in a gland in my neck/ back of jaw - it was first diagnosed as an infection by A&E - no obvious signs,just horrific pain,head,neck,jaw face & left with a numb chin or cheek for several days afterwards
Basically it eventually did turn out to be dental related - a small pocket of infection left behind by wisdom tooth removal kept flaring up in my jaw bone, meaning the nearest lymph gland became swollen & infected too - pinching the nerves in that area - trigeminal nerve affects that whole region & can be extremely painful & cause numbness too.
It took my ENT specialist to diagnose the cause though, it's a rare type of infection so my keep getting it he thankfully took seriously - my GP didn't - it didn't show up on dental X-rays, but did on CT scan.
That said,it's harmless,antibiotics will help it a lot, as will Ibruprofen to reduce the swelling & therefore the pinching of the nerves.