You should change your razor blade every 5 to 7 shaves, which for most women works out to roughly every one to two weeks. That guideline comes from the American Academy of Dermatology and is echoed by dermatologists across the board. The exact timing depends on how much hair you’re shaving, how coarse it is, and how well you store the blade between uses.
The 5 to 7 Shave Rule
Five to seven shaves is the standard recommendation because that’s the point where most blades lose enough sharpness to start dragging against skin instead of cutting cleanly. If you shave your legs every other day, you’ll hit that window in about two weeks. If you shave daily or cover large areas like both legs plus underarms in a single session, you may need a fresh blade every week.
Metal safety razors follow a similar timeline. Dermatologist Lian Collins recommends replacing safety razor blades every 5 to 7 shaves as well, even though the handles last indefinitely. Cheap single-blade disposable razors tend to degrade faster, sometimes losing their edge after just one or two uses, so they’re worth tossing sooner.
How to Tell Your Blade Is Done
Your skin will usually tell you before your calendar does. The clearest sign is tugging: when the razor catches or pulls at hair instead of gliding through it, the blade has dulled past the point of a comfortable shave. Other signals include visible rust on the blade, buildup between the blades that won’t rinse away, and any new irritation or redness you weren’t getting with the fresh blade.
Many cartridge razors have a colored lubrication strip near the blade. These strips aren’t just moisturizers. They’re engineered as wear indicators, designed so the strip material wears away at roughly the same rate as the blade edge. When the color fades significantly or the strip looks thin and patchy, the blade underneath is similarly worn. It’s not a perfect system, but it’s a useful visual cue if you’ve lost count of your shaves.
What Happens When You Use a Dull Blade
A dull razor forces you to press harder and go over the same patch of skin multiple times, which strips away more of the skin’s outer protective layer. That combination is one of the most common causes of razor burn: red, stinging, irritated skin that can last for hours or days. The Cleveland Clinic lists shaving with an old, dull blade as a direct cause of razor burn.
The risks go beyond surface irritation. A worn blade is more likely to create tiny nicks that you can’t see, and those micro-cuts become entry points for bacteria. Old razors also harbor more bacteria, especially if they’ve been sitting in a damp shower between uses. The result can be folliculitis, an infection of the hair follicles that shows up as small red or white bumps, sometimes filled with pus. When shaving causes ingrown hairs to become infected, it’s called pseudofolliculitis barbae, a particularly stubborn form of folliculitis that can leave dark spots or scarring.
How to Make Your Blades Last Longer
Where you store your razor matters more than most people realize. The AAD specifically recommends keeping your razor in a dry area and not leaving it in the shower or on a wet sink. Moisture is what causes blade oxidation (rust), and even a thin layer of corrosion makes an edge rougher and duller. If your razor came with a hanging hook or stand, use it. The goal is airflow around the blades so they dry completely between shaves.
After each shave, rinse the blade thoroughly under hot running water and give it a gentle shake to clear out trapped hair and shaving cream. Product buildup between the blades accelerates dulling and creates a breeding ground for bacteria. Some people pat the blade dry with a towel, though you’ll want to be careful not to nick yourself or damage the edge. The simpler approach is just ensuring it air-dries somewhere outside the humid bathroom.
Shaving technique plays a role too. Shaving over dry skin or without any lubricant creates more friction, which wears the blade faster. Using a shaving cream, gel, or even hair conditioner reduces drag and helps the blade glide, extending its useful life by a few extra shaves.
Does Razor Type Change the Timeline?
Cartridge razors with multiple blades (three, four, or five blades stacked together) generally hold up better than single-blade disposables. The multiple edges share the workload, so each individual blade degrades more slowly. A quality cartridge can deliver consistently smooth shaves across the full 5 to 7 use window, while a cheap disposable may start tugging at hair after two or three sessions.
Single-blade safety razors use thinner, sharper blades that cut efficiently but also dull faster per shave. The tradeoff is cost: replacement safety razor blades are dramatically cheaper than cartridge refills, so replacing them more frequently isn’t as painful on your budget. If you use a safety razor, erring on the lower end of the range (closer to 5 shaves) is a reasonable approach.
Electric razors follow a completely different maintenance schedule since the foils and cutting heads are designed for months of use, not days. But for any manual blade touching your skin directly, the 5 to 7 shave window is the benchmark to work from, adjusting earlier if your skin or the blade tells you to.