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Sprinkle diatomaceous earth in cabinets and other dark areas. Try boric acid. Buy a chemical spray containing liquid pyrethrin. Sprinkle cedar shavings where they live. Use spice sachets in your kitchen cabinets. Use a citrus or lavender spray.
This powdery substance is actually food-grade, and it's used to kill anything that crawls. It's made out of ground-up fossilized material, and the sharp edges of each individual grain puncture insects' exoskeletons and cause them to die without causing any harm to humans or pets. Sprinkle the substance in your cabinets, along baseboards, and anywhere else you'd like before you go to bed. In the morning, vacuum up the powder (and along with it, the silverfish). Wear a mask when you're sprinkling the powder, since it can irritate your lungs. This is another natural substance that kills both silverfish and their eggs. Sprinkle it along baseboards, under the bathtub, and in other areas where you see silverfish signs. Be careful not to inhale boric acid when you apply it, since it's toxic to the lungs. Avoid using it where your household pets might get into it, too. This chemical kills silverfish when you spray it along baseboards and into cracks, as well as other places where silverfish lurk. Do not apply this in your kitchen cabinets or near food sources, and don't apply it where children and pets hang out, since it's toxic. Silverfish are repelled by the smell of cedar, so you can keep them away by sprinkling it around areas where they live. Since cedar shavings can make a bit of a mess, use them in outdoor areas, basements, and other places where you don't mind having wood shavings lying around. Vacuum them up and replace them every week or so. Silverfish don't like the smell of spices, so making up little sachets of cloves, cinnamon, and other strong-smelling spices and placing them in your kitchen cabinets is a great, safe way to keep them away from your food. Both of these scents are also effective in repelling silverfish, and they're completely nontoxic to humans, of course. Get some lemon or lavender essential oil from a health food store. Dilute with water and shake the solution up in a spray bottle and spray liberally in all areas where you don't want silverfish. These sprays are great for closets, drawers, and other bedroom areas.