The common reason wisdom teeth are pulled is that modern mouths are too small for them. They crowd out other teeth and cause misalignment. Plus, we don't need them with modern diets. Wisdom teeth can cause more problems than they should so getting them pulled is usually the best approach.
Four wisdom teeth will come in but they probably won't all erupt at the same time. That means you may have four trips to the dentist, although dentists can pull two at a time if they are growing on the same side.
