MedicineNet - Content-rich commercial site includes interactive groups, ask-the-doctor feature, medical dictionary, comprehensive drug information, medical news, disease-specific information, and links.

Medscape - Searchable commercial collection of full-text articles from such useful sources as the National Institutes of Health and the Centers for Disease Control and Prevention.

Oncolink - Huge collection of cancer information and links based at the University of Pennsylvania. The best starting place found for cancer information.

Healio - Physician maintained commercial database of annotated health links. Oriented toward medical professionals, but accessible to an educated lay person. A keyword search gets you to a subject index, from which you navigate to the links you want.

American Academy of Implant Dentistry

American Academy of Restorative Dentistry

American Association of Oral & Maxillofacial Surgeons - find information about oral and maxillofacial surgery including cancer, dental implants, sports safety, jaw surgery, and more.

American College of Oral and Maxillofacial Surgeons

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Nobel Biocare

Straumann