I think they pretty much asked us to not contact them regarding why that decision was made. I was rejected without an interview, but this was the email they sent. I thought it was kinda funny. I put those parts in bold, haha. Hopefully you'll get off the waitlist soon though!!
"Thank you for applying to the Western University of Health Sciences College of Dental Medicine. I regret to inform you that the Admissions Committee did not recommend that you be invited for an interview for the fall 2013 entering class. This should not necessarily be taken as a negative comment on your credentials. There are simply far more potentially qualified applicants than there are places in the entering class. This is true not only for Western University of Health Sciences, but for every dental school in the country.
While it is understandable that individual candidates want advice as to how to make their subsequent applications more competitive, it is very difficult to provide such advice. There are literally thousands of applicants across the country that may have strong academic backgrounds, extensive experience in dentistry, and unique personal circumstances.
In general, it is helpful to strengthen one's academic background, especially in the hard sciences. Successful re-applicants in the past have also completed graduate programs or post-baccalaureate programs which are specifically geared to helping students achieve success in their dental school or medical school applications. Retaking the dental admissions test may also be helpful, but this is only one factor in evaluating a candidate's application.
In the end, no one can guarantee that any particular course of action will result in successful admission to the dental school of your choice. Much depends upon the overall numbers and qualifications of future applicant pools. In recent years, the applicant pool has become even more competitive each year. As long as applicant numbers remain high, and the corresponding first-year places remain relatively stable, there will be a large number of potentially qualified applicants who will not find a place in dental school.
On behalf of the Admissions Committee, Western University of Health Sciences, and the College of Dental Medicine, I would like to thank you for your interest in our program. We wish you success in your future endeavors."