All of that might seem like a clever workaround for iron deficiency, but it comes with serious drawbacks. Tooth enamel is the strongest substance in the body, but it’s very brittle. Ice isn’t dangerous to chew merely because it is hard, but specifically because it is cold.
Crunching and grinding ice cubes (no matter how much or what their texture is) makes the enamel expand and contract like pavement in places that get a lot of snow. Just like that pavement, the enamel will develop cracks over time.
The weaker the enamel is, the more vulnerable the rest of the tooth is to painful sensitivity and decay. Chewing ice isn’t good for gum tissue either. Because of its temperature, it creates a numbing effect while chewing, which makes it harder to notice an injury if it slips and slices the gums. Ice can even chip or break teeth.