Riggs' disease, also known as pyorrhea of a toothsocket or gingivitis expulsiva, is a historical term for periodontitis (gum disease), The condition was described as a purulent inflammation of the dental periosteum. It was named after American dentist John Mankey Riggs (1811–1885).
- Reddy S (1 December 2008). Essentials of Clinical Periodontology and Periodontics. Jaypee Brothers Publishers. p. 15. ISBN 978-81-8448-148-8.
- "Archaic Medical Terms English List Periodontal".
- Shklar, G; Carranza, FA: The Historical Background of Periodontology. In Newman, MG; Takei, HH; Carrana FA, editors: Carranza’s Clinical Periodontology, 9th Edition. Philadelphia: W.B. Saunders Company, 2002. page 7.
- Mark Twain's Notebooks & Journals, Volume II (1877-1883): The Mark Twain papers