To guarantee the best shaving result, it's important that you replace your shaver head within 1 to 2 years. By replacing the shaver head, you not only maintain the quality of the electric shaver, but the clean blades also prevent skin irritations. If you have an electric shaver by Braun, you can replace the entire shaving cassette. With a Philips shaver, you can replace the razor blades. Which shaving head you need depends on your electric shaver.