You don't have to cut all of your other nails short if one cracks; try mending it. This is a guide about repairing a cracked fingernail.
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It's so heartbreaking when you've finally grown out your nails nice and long and one of them decides to crack. Instead of cutting them all short to keep them even, you can keep them long! This is by far the best method I've found on how to save a cracked nail without going to the nail salon. You'll need a drop of super glue and a tiny piece of toilet paper
Make sure your nail is clean and dry. Cut or rip off a tiny piece of one-ply toilet paper that is just big enough to cover the crack or rip in your nail. Place the toilet paper on top of the crack and squeeze a drop of super glue on top of the toilet paper. Let dry. After a minute, it will be clear! (not pictured) Gently file if necessary. Do not file the side the crack started on too much or the bond will be useless. This method is the same as getting the nail salon to give you an acrylic seal.
By attosa from Los Angeles, CA
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