Even though the exact cause of the correlation between heart disease and gum disease are unknown, it is true that people with gum disease are more likely to have heart disease. Some scientists say that it's related to the bacteria you have in your body. The more bacteria you have in your mouth, the more likely it may affect your heart. For more information, you can read what WebMD says about this topic.
Here are some Reliable Links for dental advice
The American Dental Association's Mouth Healthy website has pages tailored to different age groups with many answers to common dental questions we may have.
For parents wanting to encourage their children to brush the ADA also has a great page 2min2x.org that is full of simple tips and resources you can use.
Colgate also has a easy to use website with an oral care center that targets common questions and answers on dental care.