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Charlie portrays a dental assistant who winds up impersonating his boss, Dr. Pain. This film may have been inspired by a Fred Karno sketch called, "The Dentist." Although Chaplin did not appear in the sketch, he was likely familiar with it. Chaplin himself hated going to the dentist & toothaches frightened him. He revisits dental humor again forty-three years later in A King In New York.
screenshots from Chaplin At Keystone (Flicker Alley)