What on earth are you talking about child?! BS, as in Bachelor of Science? Yes, I think you need a degree to get into dental school. And you need a degree from a dental school to get into a specialty program. Ergo, yes you need an undergrad degree. Does it need to be a BS: no, it can be a BA, BS, BCOMM, B$hit, whatever.
Are you trying to tell me that you'll be getting into dental school without an undergrad degree. I didn't think schools allowed that these days. 😀