Place the brush between your gums and the brackets tilting the brush toward your gums at a 45° angle. The bristles should reach under your gums. Apply short back-and-forth strokes.
Aim the brush bristles in the opposite direction tilting toward the brackets. Apply short back-and-forth strokes as before.
Aim the bristles under the wire and toward the gums. Again apply short back-and-forth strokes.
Be sure to do these steps on BOTH the outside/cheek side and the inside/tongue side of your top and bottom teeth.
The last step is to scrub your chewing surfaces.