Treatment begins with taking x-ray, photographs, a bite registration, and polyvinyl siloxane impressions of the person's teeth and gums. The dentist/orthodontist completes a written evaluation that includes diagnosis and treatment plan. Dental impressions are scanned in order to create a digital 3D representation of the teeth.Technicians move the teeth to the desired location with the program Treat, which creates the stages between the current and desired teeth positions. Anywhere from six to forty-eight aligners may be needed. Each aligner moves teeth .25 to .33 millimeters.