How to brush your teeth to prevent tooth decay and gum disease. toothbrushing is the foundation for good oral hygiene. Using a tootbrush you can clean 30-40% of tooth surfaces in your mouth. The other surfaces are reached with some form of interdental cleaning e.g brushes or floss. This video is based on the UK guidelines found in Delivering Better Oral Health learn what the professionals base their advise for effective tooth brushing on.