Eyelash and brow tinting results both typically last between three to six weeks. It varies from person to person. The results can be extended by keeping the brows and lashes hydrated using a special serum your aesthetician can recommend. Refrain from using exfoliating alpha hydroxy and glycolic acid cleansers as they can strip the color from the brows and lashes. Be gentle on the eyes and avoid rubbing them or using your fingers to remove clumps of mascara.