I finished with a B.A. Biology, then went and got my A.S. Dental Hygiene. I cannot comment on whether or not you should pursue a B.S. Dental Hygiene, but what I can tell you is the same as what SEATTLERDH and everyone said.
You get clinical experience and the comfort of already working in the patient's mouth. You will have some background knowledge before entering dental school and will already be licensed in a wonderful profession. However, the courses you take in dental hygiene will only count as non-science and will not count towards your BCP GPA. If you do want to pursue dental hygiene before dental school, I would suggest taking the 2 year route and get an A.S. instead of the 4 year to attain a B.S. Hope this helps you with your questions. If you have other questions please feel free to PM me.
By the way I am applying to dental school this cycle and it has helped me out a lot during the application process.