Minimum Qualifications : A four year High School diploma or its educational equivalent, including or supplemented by a course of study consisting of at least 600 instructional hours at an approved school for Dental Assistants; A four year High School diploma or its educational equivalent, including or supplemented by a course of study consisting of at least 300 instructional hours at an approved school for Dental Assistants plus six months full-time satisfactory experience as a Dental Assistant performing all of the following duties: taking, developing, and mounting dental radiographs, assisting dentist at chairside, sterilizing dental instrument using autoclave; or. A four year High School diploma or its educational equivalent plus one year of full-time satisfactory experience as a Dental Assistant performing the duties described in 2 above; or.