This question is an icebreaker. It's intended to lower your guard and get you to open up, offering the interviewer insight into your passions, hobbies, and interests. The interviewers would like to know you apart from what is written on your CV and school transcripts. They want to get to know you and the strength of your character. Gaining insights into your personality will help them determine the likelihood that you'll thrive in their educational environment and see your studies through to the completion of your degree. At the end of your response, remember to connect the factors you discuss and how they will ensure that you are a determined student who will stop at nothing to fulfill your pursuits as a future dentist.