Nail growth depends on the nail bed, as long as the nail bed is not damaged, half of the nail will still grow again. Most of the nail loss is caused by extrusion or inflammation, etc. After nail loss, patients should treat the nail surface in time to avoid further damage to the nail bed. Nails have the function of regeneration, as long as there is no damage to the nail bed, under normal circumstances, half of the nail loss, or can grow back. If half of the nail is lost and the nail matrix and nail bed are damaged, it will be difficult for the nail to grow back. It is recommended that patients keep the wound clean and dry, can use povidone-iodine and other antiseptic drugs to smear the wound surface, to avoid triggering nail surface infection, do not use excessive force on the fingers during the recovery period, to prevent secondary injury to the nails, and also to prevent contact with patients suffering from onychomycosis, to avoid being infected, and so on. If the nails fall off, it is recommended to go to the hospital, the doctor to complete the relevant examination, follow the doctor’s instructions for treatment.