Frictional keratosis of the oral mucosa is common and is usually a response to low-grade irritation by such causes as sharp edges of teeth or restorations, dental prosthe-ses, abrasive foods, vigorous tooth brushing and playing wind instruments.
Clinically, the lesions tend to form diffuse keratotic plaques. In the early stages these are pale and translucent and merge imperceptibly into the surrounding normal mucosa. Later, they become more dense and white and may have an irregular, shaggy surface. The habit of cheek, lip and tongue chewing is a usually characteristic variant of frictional keratosis. It results in roughened or
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