If you're chewing ice... First go to any Dr. office and have them check your iron levels. Ice chewing is a side effect / symptom of being iron deficient.
When I start chewing ice it's a definate sign that I need to start taking iron tablets again. The iron tablets make you feel like you have the flu unless you take them with your meals. The trick is... your body will not absorb the iron and the iron won't break down unless it's taken with an acid food such as orange juice.
Within a few days / weeks of taking iron again... the ice chewing and cravings don't exist. http://www.mayoclinic.com/health/chewing-ice/AN01278 If this link doesn't work, do a google search for ice chewing
Your organs do not work properly if you're iron deficient and is dangerous to have long term iron deficiency. Get it taken care of and don't ignore ice cravings.