What are invisalign aligners made from?

A. Invislaign braces are made of a type of plastic which I believe is BPA free. This is the chemical that you hear about found in plastics (such as baby bottles) that is found to absorbed in the body and passed in the urine. There is a chance that they could crack or break so you do need to handle them with care! The aligners are be weak when they are not on the teeth e.g. if you were to stay stepped on it by accident!