A 980nm diode laser onychomycosis treatment uses specific light energy to target and destroy nail fungus, or onychomycosis, by heating the infected tissue without damaging surrounding healthy areas. The near-infrared light is absorbed by the water and melanin in the fungus, creating a destructive photothermolytic effect that leads to the eradication of the fungal cells. This non-invasive treatment promotes healthy nail growth and is considered safe and effective, although the long-term persistence of the cure can vary.