Many of Invisialign's patents ran out last year [1] and there have been a few 'startups' cropping up in this space doing discounted Invisialign-like work. http

Many of Invisialign's patents ran out last year [1] and there have been a few 'startups' cropping up in this space doing discounted Invisialign-like work. https://www.forbes.com/sites/michelatindera/2017/04/25/out-of-silicon-valley-a-billion-dollar-orthodontics-business-built-with-plastic-and-patents/#4676b94130c2 https://www.forbes.com/sites/michelatindera/2017/04/25/out-o...