No, not not necessary to exert much pressure or move the Sonic-FX™ in the same manner you would as a regular toothbrush. Slightly press the brush head onto the surface of your teeth and allow the ultrasonic vibrations to clean and polish while moving the brush head gently over all tooth surfaces. For best results, use the Quadrant Method of brushing. 

Pressing too hard or brushing in one spot for too long may harm the teeth or gums.