There are no requirements, however It's preferred students have at least 6 months training in a dental setting OR be a graduate of a dental assisting or dental radiography program.
All the components listed on the DANB RHS blueprint is covered in the course.
RHS Exam Outline
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There are no guarantees however students that complete all the components of the course and follow the layout as intended have a high success rate of passing.
No, everything you need is included in the course.