Sentence 1: Marty had a hard time getting her children to floss their teeth. 
 Sentence 3: She would credit each child a nickel for every day they flossed 
 Sentence 4:  Her son, Rick, thought a nickel wasn't enough and eschewed flossing 
 Sentence 5:  Rick regretted this when his siblings got cash and he got gingivitis 
 Option 1: She decided to implement a reward system. 
 Option 2: She decided to implement a punishment system.