Sentence 1: While babysitting my cousins, I taught them how to brush their teeth. 
 Sentence 3: When I asked why, my youngest said her dad said not to 
 Sentence 4:  When I pressed further, she said he said they'd get my ugly teeth 
 Sentence 5:  Well, I know who I won't be babysitting for anymore 
 Option 1: I noticed they weren't using that method tonight putting them to sleep. 
 Option 2: I noticed their teeth were looking whiter than before because of what I taught them.