The shaver heads of your Philips electric shaver shave millions of hairs in 1 year. This ensures inevitable wear and tear on the blades, so you don't get a smooth shave. In addition, a lot of grease and dirt remains in the shaving head. This can damage your skin. Make sure you prevent this by purchasing a new after 1 year. Make sure you check the type numbers, so you know for sure that the shaver head is suitable for your shaver.