The proper brushing technique is to:
Place your toothbrush at a 45-degree angle to the gums.
Gently move the brush back and forth in short (tooth-wide) strokes.
Brush the outer surfaces, the inner surfaces, and the chewing surfaces of the teeth.
To clean the inside surfaces of the front teeth, tilt the brush vertically and make several up-and-down strokes.
Dr. Banić