Definition of Recurrent Aphthous Stomatitis: A common oral disease characterized by the development of painful, recurring solitary or multiple ulcerations of the oral mucosa. Synonyms: Aphthous ulcers Aphthae Canker sores Etiology of Recurrent Aphthous Stomatitis: Bacterial infection – L form of streptococci – streptococcus sanguis – immunologic hypersensitivity reaction to L form of streptococci Immunologic [&hellip

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