You say the tooth being removed was way in the back? The first idea I have is that the dentist may have dislocated your jaw while he was trying get the tooth out. It will eventially get better, but it can take awhile. Try Asprin or Motrin for pain and swelling along with an ice pack on the sore area for fifteen minutes on fifteen minutes of. Eat foods that are reasonably easy to chew.
Another possibility is an infection of your jaw bone, an infection will usually be accompanied by a low fever and sometimes a bad taste in your mouth. If you suspect an infection, you need to go to the dentist or doctor right away.
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Sore cheek bone.Can't eat. 
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