Laser therapy uses light at particular wavelengths to interact with fungus without affecting the healthy skin, the laser is directed so the heat will penetrate through the toenail to the nail bed where the fungus is present. In response to the heat, the infected tissue is gasified and decomposed, destroying the fungus. The laser also has a sterilizing effect, which helps prevent new fungal growth. Before the treatment can be carried out, client’s must ensure nails are cut short, cleaned and contain no polish. It is also advised clients bring clean socks to change into after the treatment.