I used my pre-health/pre-dental advisor at my school extensively. However, the best advice I was given was from the admissions offices at the schools I was interested in applying to.
I called the schools and set up times to meet with an admissions advisor. They have FIRST HAND KNOWLEDGE of exactly what they're looking for in a qualified candidate. Bring EVERYTHING: transcripts, class schedules, test scores, a resume, etc. They will be the MOST honest with you in terms of what you need to improve upon and what you need to do to gain admission to their school. It's also a great opportunity for you to connect your face with your future application. If the school doesn't allow meetings or doesn't have advisors available to meet with, try contacting the dean of admissions and trying to set up a time to meet with them directly. Or if the school sends a representative to meet with your pre-dent club, email that rep beforehand and ask to have a one-on-one with them after their presentation.
I found that most of the advice I was given from my pre-dental advisors, pre-dental club, peers, and dental students, was "feel good" advice. "Oh that's great!" or "That might be good enough." Sadly, that type of information is NOT valuable. Sometimes you need someone to tell you what SUCKS so that you can work hard to improve.
Just my 2 cents.