Silverfish cannot resist salt, which is a drying agent. When they consume salt, their bodies' water content is absorbed, and they are left dehydrated, leading
Moreover, salt's drying property also dehumidifies damp environments in bathrooms or under kitchen sinks, which are the primary breeding grounds of silverfish.
Spread a thin layer of salt on the areas prone to silverfish infestation, including cracks and crevices, cupboards, drawers, and under furniture, or apply it directly to the bugs.