Invisalign chewies are a useful device that you chew on to close any air bubbles between your Invisalign aligners and your teeth. They improve the fit of your aligners and ensure they feel comfortable and work properly. Invisalign chewies are necessary only if the aligners aren’t fitting correctly, usually when you first switch to a new set. Most of the time, your aligners should fit perfectly, due to the superior fit of Invisalign SmartTrack™ material.
Chewies are made of a soft plastic called Styrene Copolymer; they’re about the size and shape of a pencil grip or a cotton roll. They’re specifically created and designed for clear aligner treatment, to improve fit and comfort.