welcome to the book! - my education - login - Dermalogica

professional exfoliation
The human skin produces about one
million skin cells every 40 minutes, which
equates to over 36 million skin cells per
day. As our skin cells renew from the
deepest layer of the epidermis, the more
surface cells harden and lose moisture.
Eventually these cells detach from skin
(via desquamation) and are replaced
by younger cells moving up from the
deeper layers. The rate at which new
cells form in the Stratum Germinativum
(also known as Stratum Basale) is known
as cell renewal rate; the time it takes
for the cells to form in these deeper
layers until the time of desquamation
is known as the cell turnover time.
Desquamation also eliminates damaged
and contaminated cells that carry
pollutants and micro-organisms from
the environment. These superficial skin
cells don’t always effectively fall from skin
and may cause clogging and congestion
while leaving the skin’s surface dry and
dull-looking. As we age, desquamation
and cell turnover slow down, making
professional exfoliation critical to
removing the accumulation of cells that
the book
dermalogica professional-use-only products | professional exfoliation 55