Cracked toenails should be disinfected, malnutrition needs to be supplemented with micronutrients, antifungal medication should be used for onychomycosis, and surgical removal of nails is needed for onychomycosis. Cracked toenails should be sterilized with povidone-iodine, and can be treated with hot compresses or physiotherapy. Severe malnutrition can also cause cracked toenails, need to supplement some vitamins such as vitamin C, vitamin E and other vitamins. Those caused by onychomycosis can use antifungal drugs, such as amorolfine rubbing agent; patients caused by onychomycosis need timely surgical extraction of nails. Patients also need to protect the wound, prevent touching water, and eat a lighter diet during treatment. After the toenail cracked timely to the hospital, under the guidance of the doctor to deal with, do not take the liberty to deal with, so as not to cause infection. All of the above medications should be used in accordance with medical advice.