<<Disclaimer: Verify this information before applying it to your situation.>>

That's right Pica is a craving for something like dirt or even paint.
Pagophagia is a craving for ice which many people have who have an iron
deficiency - especially Celiacs.  For those of you who are eating ice
it would be wise to stop.  This causes cracks in the teeth and it is
the worst thing one can do to their teeth!

-JB