Sorry, while good advice posted for OP throughout here, don't be fooled by people sugarcoating you - this statement above is categorically false. Legacy children from parents or grandparents always hold some positive selection weight in the admissions process on their profiles (albeit little... which actually determines alot) , especially if that legacy from said university donated tons of money, is well-established in faculty or community practice currently, or made major contributions to the school's progress in any meaningful way.
It is no coincidence whatsoever that many of the students you see graduating from their DMD or MD programs have their grandparents or parents hooding them. Obviously, this doesn't push them to immediate acceptance with a horrifyingly bad profile (although there are have been exceptions even to this historically).
It's incredibly naive to believe that legacy children are simply outworking the majority, when the majority of their pool is being accepted. The truth is legacy children, with enough application tries, will eventually get in - the same can't be said for the rest of us. If their profiles are even at all competitive with others, and they happen to have any sort of pulse in communication, in-state admissions will often given them the edge on a 50-50 decision, which is often how people are decided for acceptance in-state on few seats anyway. Public dental schools would rather take the established family line committed to the dental field, since their legacy has shown a commitment beyond basic 4 years of a student paying DMD tuition. Moreover, that long-term commitment constitutes "good fit" as dental schools use today to mask any profile deficiencies against others.
It's the same nonsense you see in Automatic Admission programs that dental schools have for students out of highschool (as if you don't change from those years...) - often times, there are better statistical and overall applicants out there applying in-state in those cycles, but Automatic Admission applicants hit their bare minimums and cannot be denied the basic "good fit" narrative that's already placed on them.
Don't assume dental admissions has zero corrupt flaws. Just had to throw it out there.