When I had my wisdom teeth out... the oral surgeon severed some of the nerves... so.. my tongue.. my lower teeth, lip and lower jaw were numb..

As time went on... I experienced.. pain... here and there as nerves grew back... I had to work with the surgeon.. for pain relief.... and at times.. it did hurt...

So all grew back.. but my lower chin.... and it did take about 18 months.. I would say...