Dental Terminal portion of Hertwig’s epithelial root sheath will form a tapering tooth root.The terminal portion has been called: A Apical loop. B Epithelial Diaphragm. C Cementum. D None of the Above. 💡 Explanation Terminal portion of Hertwig's epithelial root sheath will form a tapering tooth root.The terminal portion has been called: ✓ Correct Answer: A. Apical loop.