All toenails fall off, it may be trauma, chronic eczema, nail fungus, etc. How long it takes to grow out should be analyzed according to the specific situation. 1. Trauma: If the toenail loss is caused by trauma, it can grow out in about 3-6 months if the nail bed is not injured, but if the nail bed is damaged, it can’t grow out again. 2. Chronic eczema: Chronic eczema can also cause toenail loss if it involves the toenail. In this case, the chronic eczema should be treated first, and the toenail will grow back only after the chronic eczema is cured. 3. Onychomycosis: ringworm invades the nail plate, destroys the nail plate, the more serious symptoms will involve the whole nail, manifested as the whole nail plate erosion, destruction, shedding, for this cause of nail loss, need to control the fungus after the toenail will grow again, generally need to take oral antifungal medication, due to the fungus is more stubborn, generally need to use the medicine for 12~16 weeks. Toenails all fall off, there may be other reasons, each person’s physical condition is not the same, the severity of the disease is different, toenails grow out of the time will be different, it is recommended to follow the doctor’s advice to the correct treatment.