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Your face skin
Firmness is one of the criteria of youthful skin. It is maintained by the dermis, which acts as a mattress for the skin, and by its collagen and elastin fibers. When young, the skin is firm and toned. With age, the dermal cells deteriorate and the fibers become slack. As a result, the skin loses its firmness.
This word belongs to the category Signs of age, wrinkles, firmness.