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This question is very unclear:

-Are you asking whether its necessary to do research in college in order to be accepted to dental school?
-Are you asking whether you will be able to find a spot in a professor's lab to do research--your concern being that there are too many pre-dents that want to do research?
-Are you asking, statistically, whether there are a lot of pre-dents that do research at universities?

Either way the answer is "it depends"
 
I have done research as an undergrad and plan to continue volunteering at the research lab I'm at. Is there something you have a question on, I'm not clear as well.