This will probably sound weird but, what is the point at which are you changing blades?

I am using mine with just water and I always make sure that I clean/ shake off everything afterwards. My first proper blade lasted for 4 years. Then I changed just because I clicked on ad to receive free razor from Gillette. That one is already working for 2 years.

So I get that new blades are bit nicer to your skin, but as blade getting dull is gradual I never see the tipping point when I should get a new one. My skin is perfect by the way.