If you have braces, you’ll have to avoid certain foods that can stick to or damage the brackets. Steer clear of hard foods, like apples, pears, carrots, popcorn, and nuts, as well as sticky foods, like chewy candy and gum.
One of the advantages of clear aligners like Invisalign is that they’re removable. You can (and should) take them out when you’re eating or drinking. Just remember to brush and floss before you put them back in to avoid tooth decay.