The JDE is online through HighWire Press. HighWire hosts more than 1,000 other journals, including the New England Journal of Medicine, the Journal of the American Dental Association (JADA), and the Journal of Dental Research (JDR).
A significant bonus to being an ADEA member and JDE reader is what's known as "Inter-Journal Toll-Free Citation Linking." You may find an article in the JDE and want to pursue the references. If the cited articles are from journals hosted on HighWire, you can read the full text even if you are not a subscriber, provided you follow citation links from the JDE.