First of all lets get clear what Google+ and +1s are, Google+ is a social network similar to Facebook or Linkedin but with its own unique features too. +1s are related to Google+ and a little like Facebook Likes but they also have an affect on how Google search results are shown, rather than just what is shown within Google+ itself.
At first Google+ only allowed Individual accounts, which are useful and should be setup for those customers looking to interact with you directly. You can now setup a business page as well though, which could boost your dental practice further and help with SEO.
Google+ is a great tool for building relationships with your clients and also reaching out to your clients contacts and other local businesses and individuals.