In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Q: Sentence1: David had a bad toothache. Sentence2: He made an appointment with the dentist. Sentence3: The next week the dentist had to pull his tooth. Sentence4: David went home very sore to recover. Sentence5: The next day David felt much better without the pain.
A:
Dentist, David