The external factors that usually affect the aging of the skin are: wind, heat, cold, dust, pollution and drying effects of other cosmetics. In this case the preparations will be used according to the following actions:
Occlusion. It consists in the formation of a light film on the skin that isolates it from harmful external factors and that, in addition, avoids an excessive loss of water nulante. We can mention within this group the mineral oils, vaseline filante, silicones or perhydrosqualene, all of which materials do not penetrate through the skin.
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