Sentence 1: Jim's jaw was very swollen and red. 
 Sentence 3: Jim went to the dentist, who looked at his teeth 
 Sentence 4:  The dentist found a rotten tooth, and pulled it out 
 Sentence 5:  Afterwards, Jim was always careful to brush his teeth twice a day 
 Option 1: Jim's entire jaw had to be removed. 
 Option 2: He couldn't figure out what was the problem.