Animated-Teeth.com: Canker Sores / Aphthous Ulcers: A discussion about these disorders and their causes.
Aphthous Stomatitis Web Site: Personal site devoted to Recurrent canker sores. Guide to other sites on canker sores with updates based on the most current information about causes and medications.
Canker Sores: What Are They and What Can You Do About Them?: Information from the AAFP.
eMedicine Health - Canker Sores: Consumer health resource center providing the causes, symptoms, and treatment of this condition.
Mouth Ulcers: Community for sufferers. Includes a causes survey and a treatment survey as well as an informative public message board.
Recurrent Aphthous Stomatitis and Perceived Stress: A research project investigating the relationship between RAS and perceived stress.