Exfoliation is a key part of skin health, as it promotes healthy functioning skin, supports the skin's ability for cell renewal and removes dead dull skin to make room for fresh healthy skin cells.
There are many factors that contribute to the cell renewal process slowing down. These include:
Exfoliation gives the skin a kickstart to keep renewing our cells which in turn keeps the barrier healthy and resilient
Exfoliating also brightens, smooths, decloggs pores and will help subsequent products we apply such as Serums, to be more effective as they won't have to try and pass through the dead skin first.