humans are in the process of getting rid of wisdom teeth in evolution. Over the past ten thousand years or so, humans' jaws have gotten progresively smaller, yet we still have the same number of teeth (most of us). So, when your wisdom teeth start coming in in the back of your mouth, there might be bone or other teeth in the way. If you let them come in and they are impacted (teeth in the way), you can have all your teeth pushed and turned sideways and crooked and such, plus extreme pain. I had mine out this summer, really wasnt bad at all, i think i was lucky.
jibba jabba