Dental Retentive grooves in the proximal box of a class II amalgam cavity should be A Sharp and elongated at the dentinoenamel junction B Round and elongated in the dentin C Round and short in the dentin D Sharp and elongated in the dentin 💡 Explanation Retentive grooves in the proximal box of a class II amalgam cavity should be ✓ Correct Answer: B. Round and elongated in the dentin