[1] Treatment depends on whether the tooth is primary or permanent, the degree of splitting, and its functional & esthetic impact.
Double teeth affect both sexes equally and some studies report higher occurrence in Asian and Indigenous populations.
However, the degree of separation will depend on the stage of tooth development when the gemination occurred, so the pulp chamber and/or root canal may or may not be involved.
[1] Environmental (e.g. trauma, thalidomide exposure, hypervitaminosis A of the mother, viral infections), systemic, and genetic factors can cause formation of double teeth.
[1][6][7] While the specific pathophysiology of double teeth is difficult to determine, many purport it is due to force that brings tooth germs close together during development with necrosis of the tissue separating them allowing for the enamel organ and dental papilla to unite.