Toe nails fall off on their own for the following reasons: First, fungal infection, when the toe is fungal infection will lead to unstable nail growth, easy to fall off on their own, you need to go to the hospital to improve the relevant examination, and give topical antifungal drugs for treatment. The second is caused by trauma, when the foot is traumatized, it is easy to cause the toenail to fall off. This is not too worried, with the extension of time, toenails can gradually grow out. Third, the local infection caused by the foot for a long time in a more humid and polluted environment, so easy to cause bacterial infection. You need to go to the hospital for regular changes, and if necessary, oral medication for treatment. Fourth, there are some other reasons, such as irregular diet and insufficient nutritional intake, can also lead to shedding, the need for appropriate intake of foods rich in vitamins and fiber, such as fruits and green vegetables, and appropriate intake of foods rich in unsaturated fatty acids, such as walnuts, peanuts, etc.. Adequate intake of high quality protein, such as fish, shrimp, etc. to help the growth of toenails.