How long should I use my venus razor blade before tossing it?

I shave everything (underarms, pubes, legs, bikini line) almost every day and I use the original venus razor. How often should I replace the razor blade? People say when it gets dull, but how do I know when it gets dull? I feel like I am replacing it too often (once every two weeks)

wow.. once every two weeks is a lot.. thats wasting a lot of money. Your supossed to throw it away when the strip on it starts to wear off, I know this because venus had a big trial and q&a at the mall I used to work at and the ladies where telling people all this info. I change mine every two months. As long as it isn't rusted or dull what is the point of throwing it away so fast??

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