FIG. 1 is a top view of a set of bristles for a toothbrush, embodying my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof; the left side elevational view thereof being a mirror image; and,

FIG. 4 is a front elevational view thereof.

The broken lines shown in the figures are for illustrative purposes only, and form no part of the claimed invention.