"Three-dimensional iontophoresis" is one of the safest and most effective treatment methods for onychomycosis in Shenzhen Friendship Hospital. "Three-dimensional iontophoresis" aims at stubborn onychomycosis such as nail deformation, thickening, whitening, blackening and yellowing caused by various fungi. This technology adopts microcomputer iontophoresis and bio-extraction technology, and the drug ion permeates into the deck to quickly deliver the drug to the focus, and then attack the bacteria before using the external drug, which breaks through the problem that the traditional drug treatment cannot penetrate the nail bed nail root and completely kills the fungi.