ValleyGirl, your very phrasing of the question points out what they don't want to hear. I am NOT singling you out; its a frequently asked question by preprofessional students with regard to any professional career, not just dentistry and medicine. If someday, perhaps, you were to become a faculty member in a dental school, serve on an admissions committee and interview candidates, you will have a better appreciation and understanding of why I say this. Later, I will make an analogy for you that may help you (and others) to see why this is so. They want to see a person, not a cardboard figure.
For starters, what extracurricular work do they want to see? Why they ask is that they want to know if you have any active interests in your life, interests that you enjoy for their own sake because they give you intellectual satisfaction, pleasure, for social reasons, whatever. If they do give satisfaction and pleasure you will be able to speak warmly and comfortably about them at interviews. Your extracurricular activities need not have any connection with your career interest. If asked this question at an interview, they like to see enthusiasm and evidence that you didn't put this on the application as part of a laundry list, so to speak, hoping to impress. An extracurricular activity might be stamp collecting, dancing, theater, mountain climbing...there are endless possibilties.
Nobody, not even you, would like to see someone with a monomaniacal fixation on their future career to the exclusion of all else.
In the response given above, the interviewer seemed especially interested in the work in Mexico. No surprise, that experience is off the beaten track and uncommon among predental students (especially when compared with premeds). It was a topic worth exploring in more detail because it speaks to movitation and, perhaps more importantly, motivation not just to earning a good living. Another possible reason to spend more time may have been to find out if that was just clever window dressing; possible, but I think unlikely. And I'll bet the conversation became became more interesting, lively and less formal for both parties.
Why choose dentistry? There may be many different answers. How realistic is your choice? Does it just sound like a good
career? Have you made any effort to learn what being a professional is like? Assuming your moniker is accurate, have you ever spoken with women dentists, or any professional women, about what it is like for a woman? About patient attitudes toward woman dentists? (Not all women and men are enlightened.) Have you tried to find out about different areas of dentistry? Different practice settings? And so on. In other words, have you done your homework?
The analogy, which applies to both men and women. Suppose you were dating, eventually with an eye to marriage. Would you be satisfied to consider anyone as long as they look good? Does dentistry (or any other profession) just look good? Very shallow approach. If you become a dentist that is likely to become a life-long marriage from which divorce might not be so easy, considering all you have invested in it: money, time, blood, sweat and tears.
The "dating" for dentistry is volunteer or paid experience. But don't just do it mechanically; make an effort to look beyond that by being an astute observer.
Another long answer to a short question.
Good luck.