Just head over to DAT discussion forum, and you will notice 23+ AA's popping up really frequently. Back when I was applying to dental school, I'd only see these scores once or twice a week, not like every other day. I'm convinced that the prep materials are becoming too good that even academically mediocre students (i.e. those with sub 3.5 GPA's) can score in 23+ range with using the popular prep sources. Either that or the test is getting easier, or the students are becoming smarter, which doesn't seem likely... I wonder if the score distributions for the recent years have been following the standard bell curve or a whale curve rather.