I'm actually a dental student now. I just never got around to changing my status.
I think a lot of time is spent discussing the money and hours spent on the job, but not enough time is spent discussing what the job actually entails. As a pre-dent, I didn't really understand how all-encompassing dentistry is. You can watch it being done for hundreds of hours while shadowing or volunteering (I even worked as an assistant for a while before d-school) but still not comprehend the knowledge base and skill sets it demands to do the job well. Until you've actually sat in the chair and done dentistry, it's tough to grasp the thought processes it requires.
I agree with this. A lot of the procedures that dentists do look simple, but there is a lot of background science behind it. I'm just beginning to learn this as a first year student. Diagnosing oral diseases requires knowledge of anatomy, pathology, histology, ect. Dentists must also understand the medical histories of their patients, just like physicians. Even restorative procedures require more than just hand skill. They also require a thorough understanding of dental anatomy, occlusion, head & neck anatomy, etc. The best dentists have mastered these subjects.