Nano brows are a semi-permanent makeup treatment for the eyebrows that creates the look of extra natural volume, fills in sparse patches, and modifies the shape of the arches into your dream brows. It’s a form of cosmetic tattooing – it’s done by opening up the skin and depositing color into it, but it’s not permanent. The results of nano brows fade gradually and will become invisible after about 2 years if you don’t refresh them.