Hi. I ve gone through your query and I can understand your anxiety. Once nail separates from the nail bed, it can not be reattached and a new nail will grow back slowly. If any jagged or sharp edges are seen then use nail file to smooth it. I advice you to clean your toe nail to remove the debris and apply antibiotic ointment if needed & always cover it to protect it from dust. Fallen nails can regrow entirely within 3-6months. If any sustained injuries that affected your nail bed and the matrix, the nail might take even more time to grow. Also take biotin supplements & toxic polishes Hope I have answered your query. Let me know if I can assist you further. Take care. Regards, Dr. Yogapriya V, General and family physician.