His PAT is a very high score, probably in the top 5% of test takers at least. Great job to him on that! However, the AA score is slightly below average for accepted dental school students (it is typically 20-21 these days). With his 3.2 GPA (which is also on the lower side) it might be a little more difficult for him to get interviews, but not impossible. Other criteria like extracurricular activities and dental experience would be needed to allow the ADCOMS to look past the slightly lower-than-average DAT score and GPA.