Some aligner users benefit from using chewies to make their aligners seat properly and/or more comfortably. 

Insert aligner, bite the chewies in the middle and then on the sides, go across all of your teeth.

Do this upon insertion of aligner, and chew up to 5-15 minutes

If you’re having trouble with a particular aligner, we suggest you use the chewie every time upon re-insertion (eg. after every time you brush your teeth, have a meal, or whenever else you have taken them out).

You can also do it 3 times day, 5-10 minutes a session.

Cotton chewies are more inexpensive and more readily available than the foam ones (try online or your local pharmacy), but they need to be replaced after each use, while the foam ones can be rinsed and reused.