Epidemiology and Frequency
Mouth ulcers are relatively common. These lesions cause pain and if left untreated can cause tooth rot and gum decay. Epidemiological studies show an average prevalence between .15% and 4.5%. Mouth ulcers tend to be more common in women. Mouth ulcers occur most frequently among 16-25 year olds, and they rarely occur in anyone over 55. The frequency of mouth ulcers varies from fewer than 4 episodes per year (85% of all cases) to more than one episode per month (10% of all cases) including people suffering from continuous recurrent aphthous stomatitis (RAS). People over 45 years of age are the most affected by continuous mouth ulcers.
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