FIG. 1 is perspective view as seen from the top, front and right side of a set of bristles for a toothbrush showing our new design (unclaimed environmental structure being shown in broken lines);

FIG. 2 is a top plan view thereof (unclaimed environmental structure being shown in broken lines);

FIG. 3 is a front elevational view thereof (unclaimed environmental structure being shown in broken lines);

FIG. 4 is a right side elevational view thereof where the left side view is a mirror image (unclaimed environmental structure being shown in broken lines); and,

FIG. 5 is a rear elevational view thereof (unclaimed environmental structure being shown in broken lines).

The broken lines showing the toothbrush head and neck structure are for illustrative purposes only and form no part of the claimed design.