I used my first sensor adapter for about 7 months before I changed it. It could've went longer, but I wanted to see if there was a difference in the adapter when it's new... and wow, the difference was crazy. I got a much better shave with the new adapter. So I would recommend changing it once every six months.
I've gone through a pack of Sensor Excel cartridges. Now I am trying the Arta Plus razors. I want to see how they will do since they are a little more cost effective.The sensors do look like they will fall off, but they haven't yet.
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