Usually, nails that fall out can grow back completely in about 3-6 months. However, there may be individual differences depending on the cause of the injury. If the nail was lost due to a traumatic injury that damaged the nail matrix and nail bed, it will be difficult for the nail to grow back. If the nail matrix and nail bed are not damaged, the nail can continue to grow, but it takes longer, usually 3-6 months, and toenails are slower to recover than fingernails. In the case of nail loss due to infection, such as fungal or bacterial infections, the nail may continue to grow after prompt symptomatic treatment, but the exact timing varies depending on the treatment and cannot be specified. In addition, during the nail growth period, patients should be careful not to expose the nail surface to corrosive and irritating objects to prevent the nails from growing out of shape, and to prevent sharp objects from damaging the nail bed.