Why is there a gap between my brush head and Philips Sonicare handle? The gap between the brush head and the Philips Sonicare handle is completely normal. Find out why there is a gap between the brush head and the handle. A small gap is necessary A small gap is necessary. The Philips Sonicare Brush head must be free to move in order to deliver the vibrations needed to clean your teeth. However, the brush head should not be loose and slip off your toothbrush easily. If this occurs, please contact us for further assistance.