How to see historical follower statistics for Google Plus pages

Under you name in Google+, you'll see a page menu (drop down), click on the arrow to see a list of your pages; click on a page to manage that page.

For more information, see http://www.google.com/+/business/

In order to get the individual dentists' pages to show up in places / local, you would need to divide the office building's address into separate "suites" so that each dentist appeared to have their own address. You could then move the dentist to their new location as necessary and or reassign their old suite to the new occupant. I think this would solve the whole range of problems you are describing.