The time it takes for a toenail to grow back after it has fallen off is related to the degree of fall off, the cause of the fall off and the infection after the injury. Generally speaking, the growth rate of toenail is slower than finger nail, and the growth rate of toenail is about 1cm every 9 months. after falling off, it needs to be analyzed according to the specific situation and cannot be generalized: a. Degree of falling off: 1. Partial falling off: If the patient only lost part of the toenail due to trauma, it can grow out in 1-2 months; 2. Whole falling off: It means the whole nail bed of the toenail falls off and the toenail grows out The time period is longer, about half a year before the nail grows out again. And the newly grown toenails will appear uneven until they all grow out, then they can return to normal. Second, the reasons for falling off: 1, fungal infection: if the patient is because of fungal infection, such as ringworm caused by toenail loss, you need to go to the hospital, under the professional doctor’s treatment, the toenail can grow again; 2, nutritional deficiency: the patient’s own lack of vitamins or trace elements, thus causing toenail fall off, after adjusting the diet section, more intake of meat, eggs and other foods, about 1 month can gradually grow out toenails. Third, the infection situation: 1, no post-injury infection: If the toenail after falling off, and there is no wound infection, the nail bed and nail root function is normal, according to the adult nail growth rate is judged to grow about 1mm per week; 2, local infection: the patient’s toenail after falling off, accompanied by local infection, can cause damage to the function of the nail bed, while slowing down the growth of the toenail.