Haha, wow, that's great. Not every specialty is about grades - now that boards are going pass/fail, it's going to become a lot more about you showing interest in it and your recommendations (as per one of the residency directors at my school). So many people at dental schools all over the country know each other, and it's all about connections with many of them. I was in a specialty clinic 2 weeks ago and I was overhearing a phone conversation that a faculty member was having very loudly in the next cubicle over, it went like this
"Hey there (name), how's it going? Are we going to be seeing you at the next fishing trip? Great, great - anyways, I've got this girl (name) applying to our program, and she's from your school - have you heard anything about her, or has she shown much interest? Oh, not really? Well, I guess she's not getting in then."
So, it wouldn't matter how good that applicant's grades or test scores were, she won't be getting into that residency program.