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Trim a portion of clear tape to a piece just large enough to cover the split. Apply it directly to the crack, using a free finger to hold the crack together. Then, trim off any excess tape.  This method works best when the split in your toenail does not extend down into your nail bed. Severe splits will need more immediate attention. This solution is useful if you split your toenail while at work or on-the-go. It’s not a long-term solution, though. Fix the split at home or go to a professional salon as soon as possible. the crack. If the toenail damage does not extend down into the nail bed, you can file down the crack. For best results, use a clean file and file in the direction of the split. If the split is vertical, file in a single direction to avoid further cracking. File down just slightly past the base of the crack to make sure your nail stays smooth and even. Filing a dry nail can make the split worse. To avoid exacerbating the problem, let your nail soak in warm water for 5 to 10 minutes before filing. If the split does not extend down into your nail bed, you can also glue it together. Apply a small amount of nail glue along the length of the split, and use an orange stick to press the split together until the glue has dried. This typically takes no more than 2 minutes.  Once the split is dry, drip a cotton swab in nail polish remover and rub it along the skin next to your nail to remove any excess glue. After the glue dries, apply a clear top coat to your nail to seal the crack and blend the nail together. Cut a small section of paper off from a tea bag. Apply a base coat or clear topcoat to your nail, and let it dry for about 30 seconds so that it becomes tacky. Press the tea bag paper down so that it covers the split completely, and smooth the paper so that it has no wrinkles or bubbles.   Trim the paper to fit your nail shape, and file it down to blend the paper to your nail. File in the direction of your split. Filing against your split could cause further damage. Then, apply another layer of topcoat to turn the paper translucent. Once the full extent of the split has grown out past the extent of your fingertip, you can safely trim it off. Use a pair of nail scissors to carefully cut just under the split. Then, file your nail down, running the file in a single direction so as to avoid new splits or snags.
Hold the nail together with tape for a temporary solution. File down Glue the split together. Use the tea bag method. Trim the split once it has grown out past the fingertip.