Finally passed my DANB RHS after failing twice — here's what worked

Short answer: dental assistants who pass DANB's Radiation Health and Safety exam after earlier failures usually study radiation safety principles, image techniques and error correction in detail, rather than relying on chairside experience. The RHS tests the theory behind exposures, quality and protection, along with infection control in radiography.

Areas to master

• Radiation physics and biology: how X-rays are produced, and their effects on tissues.
• Radiation safety: ALARA principles, shielding, distance, dosimetry and patient protection.
• Exposure factors: kVp, mA, exposure time and their effects on the image.
• Techniques: paralleling and bisecting angle, bitewings and panoramic imaging.
• Errors: identifying elongation, foreshortening, cone cuts and overlapping, and correcting them.
• Infection control for radiographic procedures.
• Digital imaging and quality assurance.

Study approach

1. Use the DANB RHS exam outline and recommended references.
2. Study example images of common errors and their causes.
3. Practise questions and review explanations.
4. Take timed practice tests before booking.

Confirm retake rules and requirements with DANB.

Editorial Q&A by the PracticeTestGeeks editors: general study guidance, not a personal account. Confirm fees, dates and rules with the official exam body before you book.