Or ice? Maybe it’s an iron deficiency. It’s not uncommon for patients to confess to their dentists the urge to chew ice. This is really bad for your teeth, but also can indicate an iron deficiency. Two studies published in “Science Daily” report the importance of dietary iron for people of all ages. Without the proper amount of iron, your oxygen is poorly transported to your organs and most body functions suffer. Too much iron can be toxic. If you find you have an urge to chew ice, check with your doctor about a possible iron deficiency anemia.