Tardive dyskinesia: an unrecognized cause of orofacial pain.

Tardive dyskinesia has not previously been discussed in the dental literature. It is a drug-induced movement disorder commonly involving the perioral and masticatory muscles. It can sometimes be a cause of orofacial pain. Two brief cases reports are provided as examples. Clinical features of tardive dyskinesia are presented to assist the dental practitioner in recognizing the syndrome. Suggestions for management are included.