So you want to enter dental school after 2 years of undergrad? True, you don't need a bachelor's degree to start dental school, but I don't think 2 years of college will make you look very competitive, even if you had a 4.0. If you feel so strongly about it and money is no problem, go ahead and give it a shot. But you'll probably be more competitive if you apply for fall 2005. Every year there are a few students who get in after three years of undergrad, but usually they are either stellar students in every aspect or they are part of a joint agreement between a dental school (4 years) and a particular undergrad (3 years). I was part of one these agreements.
I started dental school with three years of undergrad (at age 20). There are a small number of us here in dental school like me. Like you, I could've pushed hard and started after two, but in retrospect, that third year of college did make a difference. I was able to do some serious research and get published and take a few courses in stuff I kinda liked since I didn't have to worry anymore about cramming in pre-requisites. It was also important socially because I strengthened my friendships (people I still keep in touch with) and also had some horrific roommate experiences where I learned that even so-called friends can turn on you. Socially, I had a blast that year and academically, it was my best ever. I'm glad I did because the last three years of dental school have been very hellish (although I'm still having a good time and doing well enough). However, after three years of college I was ready to get out, as I felt I had really exhausted everything I could do at my small undergrad and fourth year would be a real bore and waste of time for me.
Starting dental school at 20 was a little rough also. Handling the workload wasn't the problem - I had a great GPA since all I ever did was study because I was too tired to go out and make friends. I also didn't bother going out with the class much because I was a few months shy of 21 and didn't want to deal with the hassle. It took me the entire first semester to adjust and a good part of second semester to find a group of friends that I clicked with.
You might feel out of place now at undergrad because you have, as you put it, "never really been on schedule for my age group." Maybe you can rush through undergrad and not feel the need to make friends with your peers at your college or have school spirit in general. The fact that you are mature and know exactly what you want to do while you sit in class with a bunch of people that have no focus or direction at all can be really irritating, I understand. But what I am trying to say is you don't want to feel too out of place in dental school. It is very important to have a good social support group in dental school because the dental school course load will be awful. You need to have peers to complain and socialize and study with to get through it. My closest friends are students who did either 3 or 4 years of undergrad, mostly. I don't relate too well to those who took time off to work/pursue other careers and those people can't understand either why I am so ahead of myself (even if it is only by one year.)
Realize this: Once you get here, you won't be ahead of schedule anymore because everyone is in the same situation as you - you guys are all struggling together to earn that DDS. It's not like college where those who are struggling in organic chem drop out of the pre-dent/pre-med track and major in psychology instead. Now, anyone who is struggling is going to fight to stay afloat because there is only one major in dental school - the DDS major. These are probably things that your committee is worried about for you.
I would advise you to stay at least one more year in college to be a more competitive applicant unless undergrad is so unbearable for you that you would rather get out ASAP. It is not unheard of starting dental school with two years of undergrad - UOP has a formal program with 2 yrs undergrad combined with their 3 yr dental school. Just that is is very, very rare.