Within 18 months your Braun shaver will cut an average of 6 000 000 hairs. In accomplishing this substantial task the cutting parts will gradually wear out and your shave may become less close and comfortable. That's why Braun recommends changing your shaver's foil & cutter block every 18 months to maintain your shaver's maximum performance. For an efficient shave every day. Braun Electric Shaver Head Replacement Series 5 52B Efficiency Routinely replacing the shaver head keeps your shave efficient with less strokes needed for greater skin comfort. Replace every 18 months Replacing the shaver head resets your shaver to new and ensures it will remain in peak condition for years to come. German Quality Every Braun shaver head is made with German craftsmanship How to replace your shaver head. For older models which have a foil and a cutter block as two independent parts you will need to change the parts in two steps: Remove the foil either by pressing the release button if your shaver has one or by pulling the foil. Rotate the cutter block by 90 degrees and pull it off holding it at the ends to avoid touching the blades. To fit new parts simply carry out the same procedure in reverse.