Human Behavior
Pencil chewing is sometimes related to xylophagia, due not so much with pencils being wood, but to the soft resilient character of the wood. At various ages, the behavior easily substitutes teething rings, pacifiers, folded paper, plastic tokens, rods, pens, hard cloth objects, hanks of hair, finger nails, and fingers. It is also sometimes associated with dental pain from dental root or ligament damage or infection, in which case tap sensitivity can be noted. It is rarely associated with diurnal bruxism & jaw pain or headache. See pediatric dentistry.
Pencil chewing can also be associated with people who have trouble quitting smoking.
Read more about this topic: Xylophagia
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