Teacher:Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Teacher: Now, understand the problem? Solve this instance: Premise: Jackson drinks one or two liters of soda daily. 
 Initial Context: All of his friends warn him that soda will damage his teeth. 
 Original Ending: Finally it is time for Jackson's dental checkup. He needs a tooth removed. Jackson stops drinking so much soda. 
 Counterfactual Context: He doesn't care because he has dentures.
Student:
He went to the dentist. Even though he has no teeth, the dentist said it was bad for his gums. Jackson stops drinking so much soda. 