Many believe that braces can cause these spots to appear, but in reality they are the result of plaque build-up just like any other form of tooth decay. These chalky patches, or dental decalcification, affect 24% of all teenagers without braces. That number jumps up to 50% in teenagers with braces. Although braces are not directly responsible for causing these white spots to form on your teeth, they can complicate the process of plaque removal. The white, chalky marks on the teeth appear when acids created by the plaque, remove minerals from the tooth surface and change the way it reflects light. Decalcification, most commonly affects the region between the gums and the brackets where plaque is most difficult to remove.
Of course you can; and it is very simple, brush your teeth. Keep the plaque to a minimum. When you brush, be sure to focus on the areas that are obstructed by your brackets and wires, place the bristles of your brush underneath the wire. Finally, try to avoid having sodas and other foods that are high in sugar and acid, as these build plaque fast.