Nail cover lifted off from the root is mostly related to external factors, as long as there is no injury to the nail bed and the nail matrix can grow out, but if the nail bed and the nail matrix is damaged can not grow out. 1. Nails can still grow out: the nail bed is the base part of the deep surface of the nail, plays a role in protecting the nail. The nail bed is rich in capillaries, which can provide nourishment for the nail, and if the nail bed is not damaged, the nail can grow normally. The nail matrix is a special kind of epithelial structure, is the starting point of nail growth, if the nail matrix is not damaged, the nail will also grow normally. 2. Nails can not grow out: because the nail bed is to provide nutrients to the nails, so after the nail bed is damaged, the nails can not get nutrients, the nails can not grow out again. The nail matrix is the starting point of nail growth. If it is damaged, the nail cannot grow. After the nail cover is removed, it is important to pay attention to cleaning and sterilizing the wound, and try to keep the wound away from water in order to avoid bacterial infection. It is recommended to pay attention to the protection of their own nails, once the nail damage occurs, to go to the hospital in time to avoid delaying the condition.