The BRAUN 83M shaving head includes the aluminum foil and blade. Over a period of 18 months, the Braun shaver cuts approximately 6 million hairs, covering an area equivalent to the size of a football field. As the cutting parts undergo this demanding task, they will gradually wear out. This can result in reduced shaving precision and comfort. To maintain optimal performance, it is recommended to replace the foil and blade block every 18 months. This ensures a perfect shave every day.