In multirooted teeth, formation of multiple roots is due to presence of:
Epithelial diaphragm
Cell rests of Malassez
Toot bud division or bell stage
None of the above
Prior to beginning of root formation, the HERS forms epithelial diaphragm. The outer and the inner enamel epithelia bend at the future cementoenamel junction into a horizontal plane, narrowing the wide cervical opening of the tooth germ. Differential growth of the epithelial diaphragm in the multi rooted teeth causes the root trunk into two or three roots.