One of my lower wisdom teeth is completely under the gum still and is sitting horizontally. I believe this is referred to as a horizontal impaction. How common is this and generally speaking, how difficult is it to remove these types of impacted wisdom teeth? I got a bit of a shock when I saw it on the x-ray because it just looks so wrong lying on its side like that. Even though it's not causing me any pain, I have been told it's highly likely to cause damage to the tooth next to it and really needs to come out but I am terrified.