The Abuse substance is a major problem in U.S. Now estimated 12.8 million Americans, about 6 percent of the household population aged twelve and older, use illegal drugs on a current basis(4). This problem is the most consider problems all of the people. Especially, dentist is belonging to this problem because dentist deal with the patients oral treatment. They are easy to recognize who has a substance abuse people as well. What is responsibility for dentist? Most of dentists have been serious thinking this ethics problem. Does dentist have to be involved in patient’s life as a physician assistant? Does dentist keep respect for patient’s privacy life even dentist recognize they are drug addiction? What is a right decision ethically for the dentist? This ethics question should think if you are health care provider or able to be that positions.