Your Dentist can extract it either way. The dentist can extract a tooth even if it's not completely erupted. Sometimes wisdom teeth do not erupt completely from lack of space or other reasons. They become partially impacted, staying stuck in the gum, and they need to be extracted without waiting for them to come out more.
Not everyone has their wisdom teeth removed. If you do have to have your wisdom teeth removed, find a doctor that knows what they are doing and try to get them all removed at the same time. Most doctors will use laughing gas for sedation. Some doctors will put you fully to sleep to remove the wisdom teeth. Recovery is about three to four days with a soft diet.
I assume you mean, why do you have to get wisdom teeth out...or else why do you get gassed to get wisdom teeth out. Answer to one: You get wisdom teeth out because they are messing up the alignment of your permanent teeth, causing you discomfort, have cavities (me), or your mouth is not large enough to accommodate them. Answer two: you get gassed so that you are not fully aware of the cracking, drilling and general pain of getting wisdom teeth out. Essentially it is to make you more comfortable and compliant so that you do not freak out on the dentist or surgeon (I would have done that, I had IV sedation when mine were removed).
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