I meant how to make them LAST longer.
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I found a way to extend my blade life by 20%. That extra 0.6 shaves I now get out them really makes a big difference!
Good point. If the effort or cost of extending is more than replacing the blades, then what is the point? Cartridge systems use expensive blades, so an effort to extend their useful life will likely have a payoff. With DE razor blades, there isn't much payoff due to their low cost. Most people spend $20 or less a year on blades. I prefer to dry my razor and blades off with alcohol, not for cost savings (as I discard after 3 shaves) but as a good way to clean and dry them off quickly. I prefer not to wipe down a razor for various reasons. Regardless, oxidation does play a big role in blade longevity.If you are using cheaper blades, or not shave everyday it would be something less than 1 cent per day. Unless someone comes from a developing world country, it is not something to care about.
Also, I suppose I should mention that there is a technique of stropping the blade on the inside of a drinking glass. I haven't tried this, since I get good blade longevity, and I would be surprised if anyone else here does this.
...I heard that cleaning them with alcohol helps and I am going to try this. Supposedly when you shave you remove a small part of skin and bacteria accumulated (more than use itself) in 1-2 days dulls them.
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To be more precise, I asked this because I wanted to make my 7am blades last longer.
They are relatively cheap and after looking at the reviews apparently they don't have a good reputation, however in my Dovo Shavette they give me incredible results: the smoothest shave and totally irritation free......for only 2 shaves.
If I can get 4 quality shaves, as somebody said it's the most a blade gives, I would be duplicating their longevity.