The toenail will not usually fall off by itself, but it depends on your own situation. If the area of the toenail is small and there are no other symptoms, most of them will not fall off on their own. If the area of the toenail is large or the wound is infected, the nail will easily fall off on its own. Toenail injury lift off is mostly caused by external damage, if the symptoms are relatively mild, you can use iodine volts to disinfect, and then use erythromycin ointment to smear the wound after bandaging, regular change of treatment can be. If the nail injury is more serious, there are symptoms of loosening, it is easy to cause the nails to fall off by themselves, if not fall off by themselves, can be surgically removed, which is more conducive to the new nails to grow out, after pulling out the local disinfection to avoid infection. After the toenail is injured and lifted off, you should go to the hospital in time.