Anything Hard, Chewy, and Sticky such as Taffy and Gum. If you should need a cough drop, try to suck on it and avoid crunching into it.
Hard Breads including Cuban, Italian, Sub rolls, Pizza crust, Bagels, and Croissants (you can rip these types into smaller pieces and chew on your back teeth).
If you eat any type of meat on the bone such as ribs, chicken, etc., pull the meat off the bone to prevent from biting the bone and knocking and brackets loose.
Stay away from eating any type of Jerky or Popcorn. Popcorn shells are known to cause gum infections and kernels can be an easy way to break a bracket.
Make sure to cut all fruits and vegetables into smaller pieces. Do not bite into an apple or carrot, and cut all corn of the cob.
Keep away from bad habits: Chewing on ice, biting on pens, pencils, and finger nails. Yuck!