Peter Thomas Roth Scrubs
After daily cleansing, exfoliation is the most important step before using any cream or mask.
Exfoliation removes debris and deeply accumulated pollutants, so that creams and serums can do an efficient job and reach deep into the skin.
According to skin type, you should exfoliate once or twice a week, unless you are using glycolic acid products.
Glycolic acid products effect an exfoliation by their very nature, so an added exfoliation is not necessary while on a glycolic acid routine.