Do you use the liners for your guinea pigs cage?

The thin white liners available for under the clippings. I did but discovered my piggy was eating it...eeekkkk! I havent put another in his cage obviously but could he have ill effects from dining on that liner. I got home from the store and in a matter of hours he had pulled up like a 4x4 inch section and it was gone. He seems to be ok and is poopin still but like one of my past questions stated... he is fluffing up his hair strange like.