Yes they do and I know because I sell a product just for that reason. It's my number one selling lash growth serum. They will grow back on their own, but my serum accelerates growth and makes them even longer than before. I have my own health and beauty business on Etsy.com.
https://www.etsy.com/shop/Naturalana?ref=si_shop
Check it out if you want.
And older question, but definitely worth a revisit.
Eyelashes are essentially like any other type of hair. It is known that eyelashes grow at a rate of only ¼ inch per month. If your eyelashes break by more than this or equal to this amount, your new growth may not be as noticeable. Genetics will also dictate your individual growth rate. (From the internet)
And here's a link:
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