With metal braces, a child will also have to make an adjustment to his or her diet. For example, a child with metal braces won't be able to eat hard foods, sticky foods, or carbonated and surgery drinks. This means no gum, hard or sticky candy, popcorn, nuts, ice, hard breads, chewable vitamins, and some other foods. With Invisalign, your child's diet and lifestyle won't be affected because he or she can simply remove the aligner before eating. It's as simple as that.