Dates won't be a problem. The visa will be valid for entry for 90 days from day of issue. The date of departure you've told them will have no bearing on it
i used a company called straightmyteeth that were very cheap and I've been very happy with the results so far. There's also smile direct club, 6 month smile, straight teeth direct and probably several others
There are other, cheaper, invisible aligner providers who do everything online through video consultations. Unless you've some major correction that needs sorting, that the aligners by themselves can't fix, you really shouldn't need to do visits
I did it in July and it was easy, however I then decided to get an O-A instead as they they weren't going to stop the extensions on the STV. In the end though, they renewed for another year. Lot of people's negatively to the STV is that they feel it's restrictive insofar as it cannot be converted to another type of visa however, if you know that you just want 3-9 months and you won't have any need for longer then it seems.to.make perfect sense to me
that must be new then as I didn't have to show that for an STV. Was identical to TV but just had to prove I had more funds. Medical certificate and check was required for an o-a visa. Maybe US consulate is stricter than UK
How is the STV too complicated? Youve got to show pretty much the same paperwork as any other visa application. Believe me, sealing with immigration over here is more difficult/time consuming. You should do anything you can to avoid it.