Most people should exfoliate their faces twice a week. This removes dead cells, revealing younger-looking skin. There is some individual variation, however. People who have oily skin or who live in warm climates build up dead skin cells faster, so they need to exfoliate more often.
People with sensitive skin sometimes experience skin irritation when exfoliating often, so once a week is sufficient. If the skin looks red or inflamed after exfoliation, the process is too harsh.
Skin cells are regenerated continually. When new cells are made, dead cells slough off at a rate of up to 50,000 each minute. If they don't shed properly, the old cells clog pores, leading to breakouts. In addition, dead cells give the skin a duller appearance. Proper exfoliation results in soft, healthy-looking skin.