Most of us from time to time have chewed on ice and while the occasional crunching is not bad a persistent desire to chew on ice can cause trouble with your teeth. You may say, it’s just water how is going to hurt my teeth? What you should understand however is that ice hard substance that can chip/crack your teeth, damage enamel, damage filling/crowns and even injure your gums. Over time people who chew ice consistently people become extremely sensitive to hot and cold food and drinks and while I can’t quote the statistics have noted that they seem to be more prone to cavities, which can be attributed to small cracks or chips not noticed by the chewer. Another aspect of chewing ice which may not be directly related to tooth health is that based on a 2014 study (http://www.medical-hypotheses.com/article/S0306-9877(14)00271-0/abstract?cc=y=) one of the indicators of iron-deficiency anemia is a compelling of the body to chew ice. So if you have an uncontrollable urge to chew ice please check with a doctor to ensure that there is not a larger issue to be addressed.