There's a new dental device company working on re-shaping the dental arch called Envisium (https://www.envisium.com/) out of Harvard. Great early results.
(Full-disclosure: I'm an angel investor in them and not a dentist, so only reporting what I've heard from the dentists.)
She/he disclosed their affiliation and reasonable promotion is permitted on HN as long as it's on-topic (this clearly is).
No idea if the product works, but please don't downvote just because it's promotional. If you're an expert in the field and have a particular criticism, please consider engaging in a measured response instead of downvoting.
(I have no affiliation with `dlg` or the company in question)
(Full-disclosure: I'm an angel investor in them and not a dentist, so only reporting what I've heard from the dentists.)