The ornamental design for a set of bristles for a toothbrush, as shown and described.
Description:
FIG. 1 is a top, front and right side perspective view of a set of bristles for a toothbrush showing my 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);
FIG. 5 is a rear elevational view thereof (unclaimed environmental structure being shown by broken lines); and,
FIG. 6 is a top, rear and left side perspective view of the set of bristles for a toothbrush of FIG. 1. (Unclaimed environmental structure being shown in broken lines).
The broken lines showing the toothbrush head and neck structure is for illustrative purposes only and forms no part of the claimed design.