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How long it lasts ....
I have been using no-no for about a month and haven't noticed a difference. It does take a long time like all of the posts state, doesn't remove all of the hair (legs are the worst) and leaves stubble. I use it every other day and there hasn't been a change in density or the texture. Very diappointing. The woman who sold it to me at sephora said that she only had to use it every 2 weeks because it slowed hair growth down, but it isn't any different than shaving...and at least with shaving it feels smoother. Oh, and you have to replace the razor blade every time...expect another $20/month minimum if you are doing more than a tiny area.
I've been using the same two blades for a month, and they still work. I haven't seen anywhere that you're supposed to replace them after each use. That would make it way too inconvenient and costly.
It seems to be reducing the density of the hair on my legs, but is more difficult to use on underarms.