Read the shave, not the calendar
How long a cartridge stays sharp depends on how often you shave, how much you shave, and your hair itself. That's why the honest answer isn't a number — it's a feeling. A fresh cartridge glides. A tired one starts asking for effort.
The cues that matter
You don't need to inspect the blades under a light. Your face will tell you first.
- Drag or tug — the razor pulls at hair instead of gliding over it
- Repeat passes — areas that used to take one stroke now take two or three
- A rougher after-feel — the shave finishes less smooth than it used to
- A cartridge that won't rinse clear — buildup that stays put is a sign it's done
Habits that keep a cartridge fresher, longer
A little care between shaves goes a long way. Rinse the cartridge thoroughly under running water after every shave — the open-back design is built for a swift rinse. Shake off the water rather than wiping the blades, and store the razor somewhere dry rather than in a puddle by the sink.
Swapping takes five seconds
When the cues show up, press the release on the Diamond Grip Handle, drop the old cartridge, and click a fresh one in until it snaps. The handle stays; only the cartridge changes.
Keeping a Refill Pack in the cabinet means the decision is easy — the moment the shave feels dull, a fresh start is one click away.