Brushing and flossing are very important. You should brush your teeth and appliances (inside and out) for at least 3 to 5 minutes. Your appliances should always be shiny and clean.
Poor oral hygiene (at all times) can lead to red, swollen and infected gum tissues. The tissues may grow over the bands and brackets. If this should happen wires may be removes by the doctor and the orthodontic treatment would not start again until the gum condition improves. You (or your parents) will be advised from time to time of the quality if your hygiene care.