The ornamental design for a disposabletoothbrushholder, as shown and described.
FIG. 1 is a perspective view of a disposable toothbrush holder showing my
new design, the broken-line showing of the toothbrushes being for
illustrative purposes only and forming no part of the claimed design;
FIG. 2 is an end elevational view thereof, the opposite end being a mirror
image of that shown;
FIG. 3 is a side elevational view thereof, the opposite side being a mirror
image of that shown;