Where you go for undergrad really doesn't matter, as long as it's not a community/vocational college. It's where you get your Masters, Ph.D., doctorate, etc. that counts. And even then, in terms of dental school, it matters even less. Your patient pool will be determined by your location and your price/quality of care. Where you go for school is more about personal preferences, ability to pay, etc.
Go to a small, cheap school; excel; get into the dental school that you like the most (for whatever reason: location, cost, curriculum, etc.) and worry about being a good clinician, not the name of your school. In the end, you'll be the same as everyone else.