Yes, it's very much skewed. If you look at the DAT scores of those attending a particular dental school on predents, you'll see they're higher (most of the time) than the scores posted on the school website. One example: predents has the average AA and TS score for UNC in 2009 as a 23 and 23 (of six individuals who posted), respectively. However, the school's official websitre listed that the 2009 1st year class had averages of 19 and 19 for those sections. In addition, you may have to question the integrity of the scores that people post on predents. For other schools, there may be less discrepancy b/w predents and the school's official averages.