The missing piece is that Invisalign treatment may also incorporate anchors that are glued to the teeth and keep the aligners in place until treatment is finished. But you can’t really argue with the results in this case.
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Three cheers for pirate medical tech! 
Screw movies. These are unimportant in the great scheme of things, perhaps except driving the plebes to adopt the p2p tech. Medical tech and servicing and spare parts and sci/chem/biomed/engineering books are where the real importance is.
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