A lot of recruiters don't want to waste their time doing the interviews, paperwork, etc until a)they know you've passed the physical and b)are getting accepted/going to get accepted.
Work on getting past the biggest hurdle (the medical clearance), then score a lot of dental school interviews. Once you can tell a recruiter that you have 5-10 interviews lined up in the fall, they will take you a little more seriously. They wouldn't let me do my dentist interviews with the Navy until a week or so before my packet was ready, as to not "waste anyone's time".