Dentists of different specialties have been called upon for their expert testimony in dental or related injury cases. These injuries can be due to an auto accident, a fall, professional negligence or injury by an animal. The practitioner is asked to evaluate the injury, write a report and perhaps testify in a deposition or a court of law for a professional opinion. This article is to discuss the role of the dental practitioner in litigation. The dentist-witness' responsibilities, legal protections, the necessary tools to give an opinion, the characteristics of a good expert witness, the demeanor in a deposition and court appearance are discussed.