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The aligners are shipped to your doctor's office, where they check the fit and may add "attachments" (small tooth-colored bumps) to help move your teeth precisely. 2. Invisalign vs. Online Aligner Brands

The reason you can't buy it online is that the treatment requires professional medical oversight and specialized hardware for planning.

You directly for DIY use. Invisalign is a prescription-based orthodontic system that must be administered by a licensed, certified dentist or orthodontist. 1. The Invisalign Process