The cell renewal factor (CRF) is a natural process that slows down with age. Babies renew their cells every 14 days, teenagers every 21 to 28 days, middle-age adults every 28 to 42 days and it takes 42 to 48 days to renew cells by age 50 or older. Many things influence our CRF like the environment, genetics, hygiene and lifestyles. The corneum layer of the epidermis consists of 15 to 20 layers. Excess dead skin cells accumulate on its surface. That is why exfoliation, also called superficial peeling, is important.
There are two types of exfoliation: mechanical and chemical. Mechanical exfoliation involves physically sloughing dead skin cells from the surface of the skin. Examples are microdermabrasion, brush machines or scrubs. Chemical exfoliation entails chemical agents that dissolve the intercellular glue that binds dead skin cells as one. Examples are TCA peels, AHA peels such as glycolic and lactic acid, and BHA peels such as salicylic acid.
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