WHAT ARE THE ALIGNERS MADE OF?

WHAT ARE THE ALIGNERS MADE OF? WHAT IS THE MATERIAL? DOES IT CONTAIN BPA?

DEFINITION From DIGITAL ORTHODONTICS - Solo Edition by Dr. Bak Nguyen

To tell you the truth. I don't know the exact composition of the material. Invisalign SmartTrack aligners are made of medical grade nontoxic and reliable plastic. The exact components are protected by patterns.  Over the last 20 years, they have improved much on the plastic itself, making it more and more smarter and reactive. What I can tell you, is that it is working and working consistently pretty well.