Here are some useful links to gather information about various dental fields:
American Dental Association - the "public" portion of their website; good basic information source; good starting point to get directed to sites with more detail on specific dental topics/issues.
Academy of General Dentistry - excellent site for dental health information.
Food and Drug Administration Consumer Information - topics range from radiation exposure in x-rays to peanut butter allergies to medical devices.
WebMD Oral Health Center - good basic information as well as topical articles such as "Sports Drinks May Damage Your Teeth."
Oral Cancer Foundation - more extensive and detailed information on oral cancer from diagnosis to treatment to rehabilitation.
Tobacco Cessation - American Cancer Society site with information on smoking and methods to help stop.
Centers for Disease Control Division of Oral Health - excellent government source of information on all dentally related topics such as fluoridation, sealants, infection control and many more.
American Heart Association - Guidelines for Premedication - guidelines for antibiotic premedication from 2007.
American Academy of Orthopedic Surgeons - Recommendations on premedication for dental procedures for patients with joint replacements from February 2009.
Wisdom Teeth - information provided by the American Association of Oral and Maxillofacial Surgeons.
Orthodontic Emergencies - good site for how to handle things that go wrong while wearing braces. The site also has general information on the benefits of orthodontics.