Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: One day Donald bit into a pretzel, and hurt his tooth He noticed his tooth had become loose Over the next few days it had started to hurt more, and was infected He made a call to the dentist for an appointment He went to the dentist and several teeth removed
 selected sentence: Over the next few days it had started to hurt more, and was infected

Donald's tooth starts to hurt >Causes/Enables> Donald's tooth hurts more