i started out with an electrical engineer, graduated and worked doing some computer programming and business analysis, thought about med school (took the mcat), and then a good friend's parents suggested dentistry.
i started to shadow the dentist, visited the ada.org website, and found that it offered daily patient interaction, you could be your own boss (set your own hours, choose the ppl you work with), opportunity to work with your hands, and gain exposure to all the cool technology that dentists have these days (patient entertainment, digital x-rays, fiber optic tools, etc.). and best of all, you get to help ppl feel better about themselves with their smile (cheesy, eh?)...
the avg. hours you work is also nice (ada says an avg. of 37 hr work weeks is much better than working 60 hrs for less pay as a programmer).
and nothing beats being able to schedule your office hours so you can hit the golf course during the weekday - truly posh...