Whether a toenail that is empty but not attached to the flesh can heal on its own should depend on the circumstances, and some patients can heal on their own. A hollow toenail that is not attached to the flesh may be caused by trauma to the nail, such as improper shoe wear squeezing the toenail or improper walking style, which may cause the nail to separate. After these causative factors are removed, most patients can gradually recover and regrow their toenails. Empty toenails can also be caused by nail malnutrition, which can often be relieved over time with proper vitamin supplementation, correcting picky eating habits, and eating more fresh vegetables and fruits. In addition, this condition can also be caused by a fungal infection, commonly known as gray nails. In this case, the toenail will have thickened, yellowed, hollow performance, and is contagious, can not be self-healing, need to be under the guidance of the doctor, the standard use of antifungal drugs for treatment, in order to relieve the symptoms. There are more reasons for empty toenails not attached to the flesh, and patients are advised to visit the dermatology department of the hospital to clarify the specific cause and to carry out the most appropriate treatment.