The frequency at which you need to replace your razor blades depends on several factors, including: Beard coarseness and growth rate How often you shave Whether you use pre-shave products or shave in the shower The quality and sharpness of the blades As a general guideline, most experts recommend replacing disposable razors after 5-10 shaves, and replacing cartridge razor blades every 4-7 shaves. With a high-quality safety razor, you may be able to get 20-30 shaves out of a single double-edged blade.Pay attention to signs your blades are dull, like tugging, irritation, or an uneven shave. Replacing your blades regularly will ensure you get a close, comfortable shave every time.