"As or bust?"
I had quite a few Cs in undergrad.. for both semesters of O-chem, another for Molec/Cell bio, in Calculus...etc, and a LOT of Bs...GPA was around 2.9-3.0.
Also, in regards to what your advisor said or says to other people, I saw screw them... At my undergrad, all they did was talk like that to other students and of course heavily favored only those who had those surreal 4.0s. When I saw my pre-health advisors (3 yrs after graduating), they more or less said, "your grades suck, don't waste time applying now (I ended up sitting the DAT on Nov 13th or so..ahah...and applied the end of Nov).... and why don't you consider public health, etc?"
I admit... I felt dejected after that but then I just got plain angry. So please...take what they say with a grain of salt... What do they know? Are they in school? Have most of these "advisors" been on admissions committees? What they know of the admissions process and requirements is exactly the same crap we see and read from stats reported by those schools and the ADA.
And even if they try to deject you, should it really stop you from applying or being scared? The average DAT scores and GPAs for most dental schools in the country are around 17-20 and 3.1-3.4. AVERAGE... so thats a lot of people above...there...and way below those figures.. There is more to you than just grades and they'll see it reflected in your app. Everyone here on SDN is capable of getting in..
Just do the best you can with the rest of the application... your essay, your DAT, etc. No point in worrying about grades now.
my two cents..