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Actually, people rarely get book worms, which don't feed so much on the book itself as much as they do the mould/mildew that has formed in the books, so... If you have the right kind of mould and the book hasn't been dried out (therefore the mould/mildew is still growing/alive), you might, in the right locale, get book worms... However, in most cases, if you're seeing damage in your, especially older, books that don't have mould, but it doesn't look like the cause was natural wear/tear, it is probably silverfish, an insect that looks a hundred times more frightening than it really is cat_sweatdrop

In any case though, if you're worried that a book might be the target of any such vile cretins, your best bet is to dust the outside of the books with diatomaceous earth; when I used to travel a lot for work, sometimes several weeks at a time, I'd actually just spray my books/bookshelves with the stuff and then, when I'd come home, I'd dust them as a I normally do.

In case you're wondering, diatomaceous earth is more than just a bug repellent, it will wipe all insects/bugs out and you can get a food grade version too, which is entirely safe cat_3nodding