Substance abuse, principally with alcohol and narcotics, is frequently reported in the literature to be more common in patients with chronic pain and TMDs than in the general population. Dentists may wish to consider the Alcohol Use Disorders Identification Test (AUDIT-C) as a brief screen for these problems. It uses three questions: (1) "How often do you have a drink containing alcohol?" (2) "How many drinks containing alcohol do you have on a typical day when you are drinking?" (3) "How often do you have six or more drinks on one occasion?