Undifferentiated mesenchymal cells found in pulp are:
Multipotent
Totipotent
Polypotent
Monopotent
Reserve Cells/Undifferentiated Mesenchymal Cells

Undifferentiated mesenchymal cells are descendants of undifferentiated cells of dental papilla, which can dedifferentiate and then redifferentiate into many cell types.
Depending on the stimulus, these cells may give rise to odontoblasts and fibroblasts.
These cells are found throughout the cell-rich area and the pulp core and often are related to blood vessels.

Key concept
Multipotent cells are cells that have the capacity to self-renew by dividing and to develop into multiple specialized cell types present in a specific tissue or organ.