Wisdom teeth were for our ancestor’s early diet of coarse, rough food – like leaves, roots, nuts, grass and things, they are no longer needed. The more evolved you are, the less likely you have them. If you don't have room for them, but they try to come through, you are more evolved than those who grow them normally.
From survey's done 70% of those with Rh negative blood had never had wisdom teeth at all. 25% had some or all of them come through and had to have them removed. Only 5% had grown them normally.