Does thinking about this make your skin crawl? Ours, too. The epidermis (upper layer of skin) is consistently replacing itself. Skin cells usually last around 2-3 weeks. While that sounds extreme, the epidermis is not the only one renewing itself — the cells in your colon die off even faster, with four day life spans. On the other hand, not all cells replace themselves. Brain cells typically last an entire lifetime… which is good news, because most of us aren't in the market to be losing brain cells!
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