G.B.
Google chew time, chewy foods, hot to stop a biter, etc....each of these topics will deal with a child who is chewing or biting.
In child care we first figure out what's going on, are they starting that dreaded biting phase or are they teething and in pain. Chewing makes teething pain basically go away since it makes the gums around the tooth stretch and sometimes even tear a bit so the tooth has more room. It can also make that first hole so the tooth can erupt.
I would take the little one to the pediatric dentist and get the regular check up, he may have a cavity starting or a tooth that needs assistance. He may just be fine too and one of those kids that like to taste every thing and in this case likes the taste of paper.