Points To Remember

4 74% have > 1 canal with > 1 foramen.

5 75% have 1 canal with 1 foramen

6,7 Assume these teeth have 4 canals (2 MB, 1P, 1DP) until second MB canal cannot be found

1,2 > 40% have 2 canals, but separate foramina are seen in only 1%.

4,5 May have 2 canals, but these usually re-join to give 1 foramen.

6,7 Generally have 3 canals (MB, ML, D) but 33% have 4 canals.

^{References:
Harty F.J., Endodontics in Clinical Practice, Mitchell L. Mitchell DA, Oxford Handbook of Clinical Dentistry.}