I don't understand all this talk about money. Sure it's good in dent, but there are a lot of other jobs that are well paid apart from dent that you don't have to study hard for for five years. The reason that is a bad answer in interviews is because it is a bad motive for dent. It's a sweetener for most careers of course, but shouldn't be motive.
I am sure there are ways of earning good wages without having to study for as long :S And if you poured the same effort you are pouring into dent into some other business related pursuit, I am sure you'd make quite a bit. You shouldn't go into dent if your not remotely interested in it. "Lifestyle" motives are fine, but a "lifestyle" that involves being away from your work life as much as possible is probably not a healthy motive either for your psychology.
ANYWAYs
My motives for dent were varied.
I wanted to get into a health related field because I want a job that does requires me to interact with and 'help' people. I also want a job that I can do that is hands on a physically useful to people. (trades are also hands-on and help people in a very physical way, but as you'll see in following motives that trades didn't suit me

)
Apart from that I love anatomy and biology, and enjoy the tougher intellectual aspects of Dent. There are also options to specialise. And there are options for research. There are options for small business. There are options for part time work for family life. It's extremely flexible, you can do with it what you want. It is happening field, always new things coming out to do and fix problems that couldn't be fixed before. There is prestige attached to being a dentist - as much as people hate dentists (they don't hate them in the same way as lawyers and politicians)
I wanted dent over med because in med, there are a lot of the above perks, but in med you have more life-and-death responsibility, and much much worse hours, and I can't handle midnight working. it's also a lot longer. (You CAN spend a long time studying dent and specialties, but you don't have to and aren't locked in) I wanted dent over pharm because pharm is not hands on, and doesn't require you to utilise your uni-learned knowledge as much or as often as dent.