The three types of foods you should avoid are:
Hard Foods: may bend wires, loosen cement under the bands or break the attached brackets and tubes.
Sticky Foods: may bend wires or pull cement loose.
Foods High in Sugar Content: may wear down your wires and brackets.
Some examples of food you should avoid are popcorn, nuts, ice, lemons, corn, hard breads, taffy, caramel, gum, and pizza crusts.