Silverfish bugs are not harmful to humans, but they can be very bothersome. They will feed on the glue and paper in your bookshelf or clothing you put out for drying. It is important to know that silverfish bugs do not live outside of people's houses! They only infest homes that have light fixtures with old bulbs (which emit a lot of heat) nearby, unvented areas behind baseboards near heating vents, under sinks where pipes enter from outdoors, inside damp places such as bathrooms or laundry rooms with leaky faucets; kitchens beneath cabinets filled with cleaning supplies and other items stored close together. If left unchecked these pesky pests will multiply quickly over time because their main food source is fungus growing on moist surfaces.