Toenails will grow back if there is no damage to the nail matrix of the toenail. If there is damage to the nail matrix, the nail may not grow back. The main thing is to see whether the nail matrix of the toenail has been damaged, most of the traumatic cases do not damage the root part of the nail, this kind of nail will still grow even if it falls off. For some infected nail loss, especially gray toenails caused by toenail loss, and damage to the toenail part of the nail matrix, there may be the formation of permanent nail damage, it can not grow again. In this case, it is important to recognize that there is no damage to the nail matrix.