Refill head for a toothbrush

FIG. 1 is a top, front, and left side perspective view of a refill head for a toothbrush according to an embodiment of our new design;

FIG. 2 is a bottom, rear, and right side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is an enlarged top plan view thereof; and,

FIG. 8 is an enlarged bottom plan view thereof.

The broken lines illustrate portions of the refill head for a toothbrush that form no part of the claimed design.