Brow tinting is a noninvasive way to enhance and define your existing brow hairs using semi-permanent dye to darken the finer and lighter brow hairs that normally can't be seen. Think of eyelash tinting like getting your roots touched up. The dye will intensify your natural lashes by darkening them and adding definition to the eye. The dye itself is similar to what you use on your hair, except it's specifically developed to be safe around the eye area. These treatments can last between 2-4 weeks.