During my last Botox injections (with a new injector) I was surprised the needles seemed dull. He had a hard time breaking my skin, and had to push them in. Since he is a well respected doctor I can't even imagine he would even come close to considering reusing needles. I read that sometimes cannulas are used to inject fillers, and the person referred to a cannula as a "blunt needle" so I wondered if cannulas are ever used to inject Botox & perhaps this would explain what I experienced.