In 18 months, your Braun shaver cuts an average of 6,000,000 hairs This causes the cutting parts to gradually wear down, which can result in a less comfortable shave. Therefore, Braun recommends that you replace the cutting blade and the scissor head every 18 months to keep the shaver in good condition. Take care of your shaver, and it will take care of you. TOP PERFORMANCE: Braun recommends replacing the shaving head every 18 months for continued excellent results EFFICIENT SHAVING: this flexible shaver head captures hair even in the most difficult areas EXACT, CLOSE AND GENTAL: with this shaver head's 4 perfectly synchronized cutting elements < strong>EASY CHANGE: it is easy to change to a new shaver head - just click QUALITY CRAFTSMANSHIP: 100% made in Germany and compatible with all Series 8 shavers