I believe it is. The nice thing about the comp program is if you decide later you want to specialize in something else, you can.
Senior year of dental school you can apply for many of the traditional specialties in the Army. Each year they determine which ones. Comp has always been one of the options. The process for applying to comp, or any of the other applicable specialties would be to submit your packet (there will be guidance stating exactly what goes into the packet), wait for the board to meet and select residents, wait for the program directors to select which residents go to which programs, graduate school and go to BOLC (if not already completed), snow-bird for a year as a general dentist, begin the specialty program the following summer.
I will claim one small bit of ignorance...I don't recall if you can do a 1 yr AEGD as your snow-bird year and then immediately begin a specialty the following summer.