Good question...
I'd also like to know what all the dental specialties are...
I know of ortho, endo, peds, perio, and surgery. What are the others? Are there any "fellowships" to further your education beyond just the specialty? I suspect that there are a wide variety of subspecialties in surgery, but what about the others?
Also, how does one go about setting up a gen practice? Do people usually start out working for another dentist to build a patient load and then go off on their own?