A couple of years ago i had a wisdom tooth pulled and while i was getting it pulled the dentists hit the next tooth next to it and ever since then my gum hurts really bad and there is a black whole on the top of the tooth.when the tooth starts to hurt i start sneezing and my nose runs i told a dentist about this before and he said that it could be a sinus infection causing the tooth to hurt but in my opinion noone has a sinus infection every month of the year.this tooth makes my head hurt on on the side its on and the gum and the top of my tooth hurts really bad my question is should i get it pulled or just keep getting it cleaned even though it doesnt help.what could this be?