I agree with Marydean. Both my boys ate their books all the time (actually Tom still does but less often than before). But now Jack loves books and Tom is starting to show the same interest. I think it is better to let the books get a bit chewed (not the good ones though!!) than to take the books away. I think it part of them getting familiar with what a book is. Also if you are uptight and stressed about the book getting damaged, it takes away from their enjoyment and I think it would leave a bad impression on them. And they do grow out of it - sooner or later!