Well I went to my Orthodontist for the monthly checkup ... and my teeth were n't moving fast enough so they had to put a power chain on . Little did I know that a ' power chain ' was a torture device for one 's mouth . Felt numb and okay after the visit , had lunch and went to work . Could n't sleep at all that night , and when I started to doze , my alarm went off and it was back to work .
According to the above context, choose the best option to answer the following question.
Question: What is the narrator getting worked on ?
Options:
A. Their eyes .
B. None of the above choices .
C. Their back .
D. Their teeth .


D