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Dental assistants help dentists as they examine and treat patients. They usually greet patients, escort them to the examining room, and prepare them by covering their clothing with paper or cloth bibs. They also adjust the headrest of the examination chair and raise the chair to the proper height. Many dental assistants take X-rays of patients' teeth and process the film for the dentist to examine. They also obtain patients' dental records from the office files, so the dentist can review them before the examination.