While I was in dental school, some guys who wanted to get in ortho and OS helped out at the faculty practice with professors (in their field ofcourse). They do this so they can "kiss-@ss" and get in the program. If your intent is this, then don't do it because everybody knows why you are doing it. But if you do this to earn some extra bucks, then why not? I doubt if you have time to so this since DS is pretty tough. DP