You do need your sweat glands, but not all of them! The pesky thing about underarm sweat glands is that they produce a salt that bacteria feeds on. This is what results in the bad odour most of us hate. However, your entire body has about 2 million sweat glands, and the ones in your underarms represent about 2% of those. So, after a miraDry treatment, your body can still release water through the remaining 98% of your sweat glands. Please see more on our website.