The 7 Worst Foods For Your Teeth

4. Ice

All it contains is water, so it's fine to chew ice, right? Not so, according to the American Dental Association. Chewing on a hard substance can damage enamel and make you susceptible to dental emergencies such as chipped, cracked, or broken teeth, or loosened crowns. You can use your ice to chill beverages, but don't chew on it. To resist the urge, opt for chilled water or drinks without ice.