I Need Some Help!!

To all you moms out there...I need some help!  This week I start my pediatrics clinical rotation, and as part of our paperwork for the class, I have to do a teaching project on a child.  I'm using my boyfriend's neighbor to teach, and I'm teaching him about the importance of brushing his teeth (as identified by his mom...he hates brushing)!  He's 7 years old...and I want to make it fun so that he actually will want to brush his teeth.  Here is where you come in...any suggestions that you have done in the past to help inspire your kids to brush their teeth?  I have been looking online everywhere, and I'm not finding any great ideas!  Let me know if you have any!!