Depending on the position of the wisdom teeth and their stage of development, what the surgery entails can vary. During a pre-surgery exam, the dentist will go over what to expect with each patient.
When the tooth is completely erupted, wisdom tooth extraction will be a relatively simple procedure. Similar to any other extraction. However, if the tooth is impacted beneath the gums and stuck in the jawbone, an incision into the gums will be necessary in order to remove the section of the bone which covers the tooth. Normally, for this situation, instead of pulling the entire tooth in one piece it will be removed in smaller chunks. This reduces the amount of bone, which has to be extracted to get the wisdom tooth out.