The occurrence of dens invaginatus, a developmental anomaly, is report
ed to be 0.04 to 10%. Treatment modalities, such as extraction, endodo
ntic surgery, and conventional instrumentation of the defect and/or th
e pulp canal, have been reported. Most suggested treatment modalities
are based on the assumption that the tissue inside the invagination co
mmunicates with the pulp tissue. However, histological studies show th
at depending on the type of invagination, the entrapped tissue is most
ly connective tissue which may or may not contain pulp tissue componen
ts. In situations where the invaginated tissue is contaminated and yet
no communication with the pulp cavity exists, it is possible to instr
ument and disinfect the invagination without affecting the pulp and sa
crificing tooth vitality. Such treatment will be referred to as ''root
invagination treatment.'' A case is described where tooth vitality wa
s preserved when only the invagination was treated.