After the toenail cap falls off, the nail can grow back if the nail root and nail bed are not damaged. The growth of the toenail is due to the proliferation and keratinization of the nail root and the rich blood vessels in the nail root and the nail bed provide nutrients for the growth of the nail, and at the same time, the nail bed influences the direction and shape of the nail growth. In the absence of serious damage to both, toenails can grow back again after they fall off. The toenail is part of the skin, the epidermis of derivation. After the toenail has been damaged, it is important to have standardized treatment under the guidance of a doctor so as not to affect the growth of the toenail.