I'm in the US. Mine were already growing above the gums so I could feel/touch them. The dentist I went to put me on novocaine and used a diamond drill to split

I'm in the US. Mine were already growing above the gums so I could feel/touch them. The dentist I went to put me on novocaine and used a diamond drill to split my wisdom teeth into halves that he then extracted out. I think people who have surgery, are the ones whose wisdom teeth have not really grown out yet. So maybe that's what the article is referring to.