2min2x.org - Brush your teeth for two minutes twice a day! Even though this applies to everyone, this website is tailored to children watching a 2 minute video while they brush.
www.mouthhealthy.org has all the information you need to keep healthy mouth. Learn about prevention, dental health topics, and so much more!
Toothwisdom.org has a multitude of health resources for older adults including dental care.