Onychomycosis refers to fungal infectious diseases that occur on the deck, nail bed or surrounding tissues, mainly caused by dermatophytes, which are characterized by changes in color, shape and texture. Laser ash nail is a new type of treatment. It uses the principle of laser to irradiate the disease with a laser to kill the fungus without destroying the normal tissue. It is safe, painless and has no side effects. It is suitable for all kinds of applications. For example, in cases of onychomycosis (nail fungus).