I'm with you gonnabdds, I am having regrets of my own. I was actually shooting for a 75; only studied the week before looking over school handouts and the most recent 3 released exams. I came out of the test thinking I had completely failed, so I was completely shocked when I got back an 86.
And that was only due to a miserable 77 in anatomy; the other 3 scores were hovering just above and below the 90 mark. It really makes me wonder how I could have done if I had put some effort into it. I am pretty set on general dentistry (although I have had some crazy fleeting thoughts about prosth) so I didn't feel that hunting the 90 was worth my time. But now it seems that it would have been a pretty achievable goal. In any case, it would have given me my choice of GPRs. There is NO WAY I am going to retake it, but I do regret not working harder.
If you do decide to retake, be absolutely sure you can do better. I can't imagine a worse feeling than working your butt off for the next 3 months and getting back an 88.