If Dental Specialty Forums open up, I doubt that too many posts will register! Of course, OMFS, Ortho, GPR, AEGD will get "some" posts, but for Perio, Prostho, Pedo probably will only get one or two posts every month. Even with posts, mainly they will be questions and no one will reply due to the lack of residents lurking. Even with residents lurking, most of them won't post or help out!
You can't obviously only open OMFS and Ortho forums and not have other dental specialties, so I suggest that leave all dental specialties within the Dental forum for now until more demand is out there for new forums.
I know for OMFS, there are several threads that are demanding and long with numerous pages, but just not enough to earn its own forum yet.