Recurrent aphthous stomatitis (RAS),which is sometimes referred to as a canker sore,is a common oral lesion occurring in approximately _____% of the population.

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Recurrent aphthous stomatitis occurs in approximately 20% of the population.It is seen after 20 years of age and has an unknown etiology,although an involvement of the immune system is suspected.RAS presents clinically as a few small to many large ulcers.These ulcers can even coalesce into giant ulcers.The other choices do not correctly depict the percentage of the population in which RAS occurs.

Recurrent Aphthous Stomatitis (RAS),which Is Sometimes Referred to as a Canker