Recurrent aphthous stomatitis (RAS), popularly known as "canker sores," is the most common ulcerative disease of the oral mucosa. While UpToDate articles typically require a paid subscription to download in PDF format, you can access comprehensive clinical overviews through open-access journals and scientific repositories. Clinical Overview of Recurrent Aphthous Stomatitis
RAS is characterized by painful, recurring ulcers that typically affect the non-keratinized oral mucosa (such as the inner lips, cheeks, and floor of the mouth). (PDF) Aphthous Stomatitis - ResearchGate Download Recurrent aphthous stomatitis ToDate pdf