I dont know much about you but may be the competitive stats you think you have is not really that competitive when compared to stats of other people. the people you say "qualified" may not even be qualified to get admitted (decided by the adcoms). and the smart and the hardworking people with low stats who do masters, postbach, and still dont get in may be not even that desirable to adcoms and they rather accept fresh, young, attractive 21/22 year old students with great stats, average life experience, and above average maturity. You can't even say you are qualified to go to dental school (or speak for many other "qualified" people for that matter) because they and you clearly haven't got admitted to dental schools. Hence, you guys are surely not qualified.
having good grades mean the students can "learn" how to prep the tooth with full aesthetic traits in a reasonable time limit set by the school. students with good grades are the "low risks - high rewards". accepting students with bad grades with the hope that they can change, study well, and can prep the tooth super well is a "high risks - low rewards". Dental schools, and you, probably prefer the low risks - high rewards for all choices you make.
if you dont want to waste your time investing and pursuing your passion in dentistry, you can rightfully drop and quit. Heck, you need to accept the fact that many people with low GPA who do masters, do postbachs, and work as dental assistants for almost 1/3 of their living years, may not even get in. assisting experience/volunteer experience is required up to the certain hours but mean nothing without the corresponding good grades/DAT.
Thus, experience/volunteer/shadowing and average grades/average DAT open the door for you to dental school interviews. However, doors are also open for students with high grades/high DAT and okay EC. The good grades/good DAT score are the factors that get you in dental schools.
When the '15-'16 cycle starts, many many pre-dental students with average GPA/average DAT boast that they have 5-6 interviews and say stats is not everything. I'm pretty sure only a small percentage of these students ends up getting admitted and the rest of students gets on the waitlist and reapplies. The higher the stats students have a higher interview success rate (number of acceptance/interviews received).