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The Publication Manual of the American Psychological Association (2010) advises writers to, "use the dash to indicate only a sudden interruption in the continuity of a sentence" (p. 90).

Tip: The dash is best left to informal writing because "overuse weakens the flow of material" (p. 90).

APA Note

For formatting rules for an em dash (e.g.--) or an en dash (e.g.-), please see "En or em dash?" in Writing Tips.