Change a cartridge or disposable razor every 5 to 7 shaves. That's the range the American Academy of Dermatology gives in its shaving tips to cut down on irritation. Swap it sooner if it tugs, skips, or shows rust. Double-edge safety blades are cheap enough to change every few shaves, and electric shaver foils last about 18 months.
Count shaves, not days. Someone shaving a coarse beard every morning gets through a cartridge in a week. Someone shaving their legs twice a week might get three weeks out of the same blade. The first shave that pulls is the real signal; the count just tells you when to start paying attention.
Razor blade replacement schedule by type#
| Razor |
Replace |
Notes |
| Cartridge razor |
Every 5 to 7 shaves |
Coarse or dense hair: closer to 5 |
| Disposable razor |
Every 5 to 7 shaves |
Throw out the whole razor |
| Double-edge safety razor |
Every 3 to 7 shaves |
Blades cost very little, so err early |
| Electric foil shaver |
Foil and cutter about every 18 months |
Braun's recommendation for its shavers |
| Electric rotary shaver |
Heads on the maker's schedule |
Check the manual for your model |
| Straight razor |
Doesn't get replaced |
Strop before each shave, hone when stropping stops working |
Signs your razor blade is dull#
- It tugs or pulls hairs instead of cutting them cleanly.
- You need a second or third pass to get the same result.
- Your skin is red or burning after a shave that never used to bother you.
- You're nicking yourself more often.
- There's rust or discoloration on the blade or the metal around it.
On many cartridges, the colored lubricating strip above the blades fades as you use it. It's a rough hint, not a precise counter, and a faded strip on a blade that still cuts cleanly doesn't mean you have to toss it.
Does a dull razor cause razor burn and bumps?#
It makes them much more likely. A dull blade needs more pressure and more passes, and every extra pass scrapes skin that's already been shaved. That friction is what leaves skin red and stinging. A dull edge also pulls at hairs before it cuts them.
The AAD's advice for an easier shave: wet your skin and hair first (right after a shower is ideal), use a shaving cream or gel, shave in the direction the hair grows, and rinse the razor after every swipe. If you have acne, the AAD suggests trying both electric and disposable razors to see which irritates your skin less, and shaving lightly around breakouts, never over them.
If bumps, ingrown hairs, or irritation keep coming back even with a fresh blade and careful technique, see a dermatologist. Curly or coarse beard hair in particular can need more than a new razor to stop ingrown hairs.
Why legs and faces wear blades differently#
Five leg shaves cover a lot more skin than five face shaves. If you shave your legs, underarms, and bikini line with the same razor, you're using it up several times faster than the count suggests. Coarse, dense facial hair is hard on edges too.
A simple fix: keep separate razors for different jobs, or count a full leg shave as two shaves. After a few blades you'll know your own number, whether that's four shaves or nine.
How to make a razor blade last longer#
The idea is to keep a sharp blade sharp for its full life, not to squeeze extra shaves out of a dull one.
- Soften the hair first. Warm water and a minute or two of shaving cream make the blade's job easier.
- Rinse under running water after every stroke so hair and foam don't pack between the blades.
- Don't tap the cartridge hard against the sink to clear it. It can bend the blades and the guard.
- Shake off the water and let it dry fully. The AAD says to let your razor dry completely between shaves to keep bacteria from growing on it, and not to leave it in the shower or on a wet sink.
- Store it upright in a dry spot, like a cabinet or a stand outside the shower.
Don't wipe the blade on a towel; you'll dull the edge and leave fibers on it. Tricks like stropping a cartridge backward on denim aren't a reliable way to restore a worn edge.
Never share a razor. And replace any blade that's been dropped in the toilet, splashed with cleaning products, or used by someone else.
When to replace electric shaver heads#
Electric shavers have blades too, and they wear out. Braun's guidance for its foil shavers is to replace the foil and cutter about every 18 months, and sooner if you see nicks, dents, or wear patterns on the foil. Braun also says to check the foil before each use and to swap the foil and cutter as a pair, because changing both is what brings the shave back to full performance.
Rotary shavers have their own replacement schedules, which vary by brand and model, so check your manual. Either way, a shaver that starts pulling, takes longer, or leaves patches it used to catch is telling you the heads are worn. Clean it the way the manual says; some heads can be rinsed under water and some can't.
Safety razor and straight razor blades#
Double-edge blades cost very little, so there's no reason to push one past the point where it feels smooth. Change it every few shaves. Handle blades by the short, blunt ends, and drop used ones into a blade bank or a sealed metal tin instead of loose in the trash, where they can cut whoever empties the bin.
Straight razors aren't replaced. You strop the edge on leather before each shave and hone it on a stone when stropping no longer brings it back. Check for chips and rust, and store it dry. If you don't know how to hone, a professional sharpening service can do it.
Keep a spare and track the count#
Put a tally mark on a sticky note inside the cabinet, or note the date you put in a new blade. Replace it at the first uncomfortable shave, then aim one shave earlier next time. If you'd rather not count, a weekly ChoreLists.com reminder works for daily face shavers. Pair it with the other small bathroom swaps, like your toothbrush replacement, and keep the next blade in the drawer so the reminder doesn't turn into a shopping trip. If you tidy up your neckline between haircuts, a fresh blade makes that job easier too.