The ornamental design for a childrentoothbrushbox, as shown and described.
FIG. 1 is a perspective view of a children toothbrush box, showing my design.
FIG. 2 is a front elevation view of the children toothbrush box of FIG. 1, a rear elevation view of the children toothbrush box of FIG. 1 being symmetrical to the front elevation view of the children toothbrush box of FIG. 1, a left side elevation view and a right side elevation view of the children toothbrush box of FIG. 1 being the same as the front elevation view of the children toothbrush box of FIG. 1.
FIG. 3 is a top plan view thereof.
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a perspective view of the children toothbrush box of FIG. 1 wherein parts of the children toothbrush box are rotated.
The broken lines in the drawings depict environmental structure and boundaries and form no part of the claimed design.