The key function of PORE REFINER Serum is to control sebum production. Using it in the long run will reduce the chance of pore clogging. As a result reduce blackheads and whiteheads. However, for existing ones, the PORE REFINER doesn't extract them. You will need to give sufficient amount of time for the whitehead to dissolve or fall off naturally. Exfoliate once to twice a day will speed up the process. Skincares are not medicated products. Please be patient and continue with your daily basic care. Slowly, you will see pleasant improvements to your skin texture and condition.