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Rats chew their entire lives. Vermin have hypsodontic incisors: the teeth never stop growing. Rats must constantly file their chompers, which grow seven inches every year and are completely replaced every forty to fifty days, or the top incisors will grow through the bottom jaw and the bottom teeth penetrate nasal cavities. Thus, a rat can gnaw through carpet, insulation, wood, plastic, tile, brick, metal and concrete. Only three substances prove impenetrable against the rodents: adamantium, steel wool and vibranium, and two of those exist only in the realm of Marvel comics. Steel wool splinters when chewed and jagged strands dig into the gums, pierce the tongue and palate. ..."