- 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.