- MedlinePlus: Gingivitis
 - Describes the earliest form of periodontal disease, including its symptoms, treatment, and possible complications. - Porphyromonas Gingivalis Genome Project (PGGP)
- Researching the genetic sequence of Porphyromonas gingivalis, the organism most strongly associated with human periodontal disease.
- MayoClinic: Gingivitis
- Extensive information about one of the most common forms of gum disease, including symptoms, causes, treatment, and prevention.
- Gum Recession Project, The
- Discusses and illustrates various gum problems that can occur, and outlines how they are often treated.
- California Dental Association: Receding Gums
- Explains receding gums as one of the symptoms of gingivitis.
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