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Published Online:https://doi.org/10.1176/ajp.118.12.1132

Thirty-one NP patients exhibiting the oral sign of black hairy tongue were identified by the dental service; 46 control subjects were selected at random from patients examined at that time who did not exhibit the sign. Records of ataractic drug treatment for the 6-month period prior to the examination were obtained for both groups. No significant relationship emerged between drug dosage and presence of the sign of any criteria examined.

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