The ornamental design for a brush with wave-shaped bristles, as shown and described.
FIG. 1 is a top plan view of the new ornamental brush with wave-shaped bristles of the present invention, with the bristles insertably engaging a representative handle to be contained therein, wherein the handle is shown in broken lines for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a right side view of FIG. 1, of which the left side view is a mirror image; and,
FIG. 3 is a front view thereof, the back view being a mirror image.