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RECURRENT APHTHOUS STOMATITIS (Recurrent Mouth Ulcers) What are the aims of this leaflet? This leaflet has been written to help you understand more about Recurrent Aphthous Stomatitis (RAS). It tells you what it is, what causes it, what can be done about it and where you can find out more about it. What is recurrent aphthous stomatitis (RAS)? RAS consists of recurrent bouts of one