Just to put my two pennorth in, i personally change my needle each time as I tried reusing one once and God it hurt the second time, maybe I just hit a bad spot, but it's not something I would willingly do again, but that's just me being a big baby. I can see how, with the size of my needles and the fact that skin is quite tough, that they could blunt easily, but again, no evidence to the contrary that I believ anyway, am just saying I could see how it COULD. As for lancets....... Well I try to change every day, but like most posters, generally I forget until it hurts more, those are thick enough though where you can see how much they have blunted with the naked eye. I was diagnosed two years ago, and I think I have only just come to the end of my first box, I have several as very often when I ring for repeat I ask for everything, rather than listing, and secondly, one dozy receptionist can't hear the difference between lancets and Lantus, she has cocked this up even when I have spelt lantus out and said its the injection pen as stated on the prescription.