considering a large amount of students applying have their bachelors degree, it would make you a more competitive applicant to have one. take a look at UCSD’s program for example for requirements
https://career.ucsd.edu/plan/explore/pre-health-med/dentistry/prepare.html
and also this
https://www.adea.org/GoDental/Application_Prep/Preparing_for_Dental_School.aspx
also be aware some classes can only be taken at an upper division level (at a 4 year)
https://www.adea.org/GoDental/Application_Prep/Preparing_for_Dental_School/Prerequisites.aspx