Dental What should be the depth of grooves placed in occlusal surface of the tooth during tooth preparation? A At least 1.0 mm B At least 2.0 mm C At least 1.5 mm D At least 1.2 mm 💡 Explanation What should be the depth of grooves placed in occlusal surface of the tooth during tooth preparation? ✓ Correct Answer: A. At least 1.0 mm