No need for an MBA unless you want to pursue setting up a small or mid-size dental corporation. Then the MBA is only worth its connection and prestige to find you capital or investors and other qualified executive and management employees.
If you are totally clueless on any business operations, truly want to grow your business, etc. I would suggest an online Masters of Science in:
Innovation and Entreprenurship
Global Business
Management and Administrative Sciences
These above are practical and helpful degrees with classes that will truly you help you. Also since its more your looking for knowledge go to your local State school or State flagship. Its cheaper and only 1 full year for each (or you can spread out 2 if you have to).
These MS degrees will make you a better businessman.
The MBA will get you in touch with better businessmen.