I had invisialign for 2 years before switching to regular braces. Metal braces can generate much more force in more directions, which was necessary for completing my treatment (very stubborn teeth). They're dead simple and reliable. But my ortho is very advanced and helped it along as much as possible - I used this pulsing mouthpiece at night called AcceleDent which helped my teeth move quicker. We also talked about an option called Propel? which essentially made small bone perforations which encourage teeth movement.

My takeaway is that teeth are very stubborn and don't like to be moved quickly. And that once moved, they really want to go back to the way they were. There is a lot of new tech, but you've gotta find the right ortho. I shopped around until I found a forward-thinking one who was willing to try new things, and got spectacular results within a reasonable timeframe.