Teacher:In this task, you're given a context, a sentence,  and a character. The sentence describes an action or job of the given character. Also, the context provides more information about the sentence or the character. Your task is to write the character's motivation by doing a specific job, which is given in the sentence. You can use context to find the motivation; however, all the inputs do not provide context. Also, in some inputs, there can be zero motivation; output, 'None' in this case.
Teacher: Now, understand the problem? Solve this instance: Context: Ted had a toothache and went to see the dentist. In the office, the dentist took a look at Ted's teeth. 
 Sentence: He chastised Ted for not brushing well. 
 Character: Dentist
Student:
to teach him