They only really hurt if your mouth hasn't got the room to fit them. If you have minor gaps inbetween teeth that your dentist hasn't corrected then your wisdom teeth will correct them as they will push the teeth round to fit the new ones. It hurts but less so that a wisdom tooth cutting without any give room. Also the one to be aware off especially with the upper jaw is that the tooth can grow upwards in to the skull which = teh nastiness