Sentence 1: My teeth have been hurting all of a sudden out of nowhere. 
 Sentence 3: The dentist asked when the last time I flossed was 
 Sentence 4:  I honestly couldn't remember but I know I don't floss often 
 Sentence 5:  The dentist told me I have gum disease and need to start flossing 
 Given Sentence 2: I booked an emergency dentist appointment right away.