http://www.healthyteeth.org

I just came across this cool website http://www.healthyteeth.org looks like it was designed for kids, but the site is an awesome guide to oral health.

There are also many explanations of the oral issues, and causes for the issues. no to mention the great prevention guide that talks about how Fluoride works.

And while you are on the site don't forget to click the link "a visit to the dentist" and watch a nice 3D movie of the dental office.