A method for producing a restorative material that is to be used for restoring a missing tooth part in the oral cavity, comprising a step of, within a supporting holder, locating a first cell mass and a second cell mass, one of which comprises tooth bud-origin mesenchymal cells while the other comprises epithelial cells, in such a manner that these cell masses are in close contact with each other but not mixed together and then culturing the cells to reconstitute a tooth bud or tooth, and a step of confirming the direction of the tooth bud or tooth having been reconstituted by the culture so that the tooth bud or tooth can be embedded in the missing part with the fore-end thereof facing inward in the oral cavity, wherein the tooth bud or tooth, the direction of which has been thus confirmed, is employed as a restorative material for providing an equivalent for the missing tooth in the missing tooth part. A method for restoring a missing tooth part which comprises embedding the reconstituted tooth bud or tooth obtained by the above method in the missing tooth part.
