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So, to keep the top (3rd) layer of skin healthy and young for as long as possible, we need to follow 2 rules.
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The 1st rule is associated with the 5th floor: it is crucial to retire grannies on time or we may develop skin with uneven texture and unhealthy colour + it will make it harder for our skin care products to penetrate.
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2nd rule is associated with the 1st floor.
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JOURNEY.
Inhabitants of the Epidermis move from the 1st to the 5th floor in approximately 28 days.
The older we get, the slower they move.
The whole journey may become 2-3 times longer.
It means that instead of having 28 days old grannies on the 5th floor, we have 42 or even 72 days old nans!
As a result, our skin does not look as fresh and young anymore..
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NEWBORNS.
Inhabitants of the 1st also become less active and produces less inhabitants, making skin thinner and more fragile.
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So, the 2nd rule in order to keep skin young and fresh is to regularly activate/stimulate/wake up the cells of the 1st floor, so they constantly produce decent amounts of new cells which will keep our skin fresh and strong.