Dental Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is: A 10 μm — 20 μm B 3 μm — 9 μm C 50 μm — 110 μm D 200 μm — 250 μm 💡 Explanation Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is: ✓ Correct Answer: A. 10 μm — 20 μm