Eric, bro, you don't have any PPID (international) students in your class yet. Yes, you are correct that their first summer quarter is brutal. They have something like 20 classes. They don't have a tougher time than you or I will finishing clinical requirements because they are dentists already and do things faster than we do. So they didn't get that first summer of doing perio. No big loss.
The school gives them as much attention as it gives you or I. I've seen it first hand in class, chart review, and clinic. I think WestCoast is correct that few of them specialize. From what I've gathered some come in planning on specializing and often change their minds simply because they're tired of being in school and want to make some money. I imagine there will always be an extra obstacle as a foreign trained dentist for acceptance to residency programs, even after doing a PPID program. That's the prerogative of the residency directors.