This document discusses various types of abnormal chewing behaviors. It identifies four main types: sluggish mastication, unilateral mastication, mastication using incissors, and tooth grinding. Sluggish mastication can be caused by lack of interest in food or oral cavity pain and can lead to underdeveloped teeth or muscles. Unilateral mastication favors one side of the mouth and can cause hypofunction on the unused side. Tooth grinding can be caused by medical conditions or stress and anxiety. Prolonged or abnormal sucking behaviors in infants like thumb sucking or prolonged pacifier use can also cause dental issues by impacting tooth and jaw development.