check the ADA website for the programs you may be interested in learning about. I applied to 18 GPRs and interviewed at 12 before I chose one. There are phone numbers and emails on the websites. Most GP directors are happy to answer any and all your questions, and maybe invite you to visit. I did that in my 2nd and 3rd yrs of dental school and I did as many externships as possible. I learned a lot but doing that too...got to see the areas, learn about the commute times, the strength of the program, how many did GP and those the opted to specialize. It was great because after my volunteer time at the program, I asked an attending to write a letter of recommendation so I could add it to my portfolio... it also helped when I was looking for my first job.