A dentist assistant, more commonly called a dental assistant, supports dentists during dental exams and procedures. They may prepare patients for treatments, process x-rays, and set out and sterilize equipment or dental instruments. They typically also perform administrative tasks, such as scheduling appointments, completing paperwork, and assisting patients with billing and payment. Specific duties can vary by state and by the dental practice. Some states allow dental assistants to perform coronal polishing and other dental procedures. Some dental practices may have dental assistants perform lab tasks under the supervision or direction of the dentist.