I recently had some dental work done that I apparently didn't need. I
had 2 crowns half way done along with a root canal and am waiting for
the porcelain crowns to come in. I got a second opinion, and the
dentist told me I got charged for things I didn't need, and got way
overcharged for things I did need.
My question is what body regulates this sort of thing and how do I go
about correcting this? I'm not sure if it's the Better Business
Bureau.

Thanks!

Try this link:

http://www.dentalwatch.org/reg/complaints.html

It also provides a link for individual state licensing boards...

Thank you for that link edbr-ga!