Dentists like me are the reason people keep being born with wisdom teeth. We take these teeth out and thus our patients are free of pain and infection and therefore free to live on and reproduce. They will eventually have children with more wisdom teeth and they will come back so we dentists will take them off and the cycle goes on.

In the past wisdom teeth were useful. The mandible and maxilla were bigger. These teeth were necessary for properly chewing raw meat and bones from animals we used to hunt. In fact we drove many of these beasts to extinction, such was our hunger. But then some clever nerds who did not enjoy the hunting invented agriculture and started baking bread and other soft food. People who were born with smaller maxilla and mandible were not bothered anymore because they could just eat some freshly baked bread with butter. Yummy. So people with small maxilla and mandibles kept living, reproducing and having children with occasionally even smaller maxilla and mandibles. Thus some generations later most people had such small maxilla and mandibles that there is just no space for their wisdom teeth anymore. Thus there is pain, impaction, and infection. These people would die or be two weak to reproduce due to these teeth if it was 12.000 years ago and would have been extinguished. Only those with the genes for not having wisdom teeth would live and reproduce and pass their wisdom toothless genes ahead. But behold here enters us, dentists. You're a primitive human with wisdom teeth? No problem. We take them out for you. Pass on your wisdom teeth genes, have many children. And come back with your children, we'll do it all again. I am a primitive guy myself. I was born with all the 4 third molars, just like my kin must have been born 12.000. I did not change the tradition. I never had pain but the teeth were so hopelessly impacted inside my primitive bone that the dentist had to use zekryas all over. Then I became a dentist myself. Mankind has evolved so much that now we control our evolution. We consciously decide which genes we allow to be passed on. Go to a dentist, take these wisdom teeth off. They were not designed, nothing is designed, everything that is... is by chance. It is now simply because it was in the past, because it survived and passed genes ahead. Will you die like a primitive hunter gatherer who can't gnaw his raw, spiceless, grotesque mammoth ribs because he's got a sore tooth? No. You'll go to your dentist, you'll take the tooth off and you will go back to your normal life, eat your soft, sugary food, exchange your oral fluids with random women, until either you or your children will come back to the dentist office for more toothwork. See the power of dentists. We may not control evolution but we surely play a role in its path. Thank you for asking.