Are 2 weeks per tray during refinement the normal process?

In general patients with severe crowding or "crooked teeth" are best served with orthodontic treatment first. This allows the teeth to be positioned correctly as well as optimization of the bite (how your teeth fit together and function).  Based on what I see in your photo I would strongly...

Teeth can be intruded or extruded. In this case, extruding the upper front teeth, which are quite hidden, would show more of these teeth. Intruding the lower front teeth can also be done but intruding the whole lower teeth is a little bit more difficult because if all the teeth are on the same...

The flare in the photo is handled very well with Invisalign. Express treatment, using fewer aligners at less cost, may be possible but can't be determined without submitting the case for computer rendering.

The fact that you know what "buccal corridors" means tells me that you have been listening (reading) to doctors who stress expansion as part of their treatment plan.The whole idea of buccal corridor problem is really a made up issue designed to justify expansion treatment. There is no good...

Since you haven't worn any of the aligners in 18 months, the easy answer would be to restart with the highest number aligner that fits comfortably, yet snuggly.But since you can't find numbers 2-6, then I'm afraid you'll have to redo all of the initial impressions and will probably incur a...

Unfortunately once the teeth move it’s not that easy to get them back. You will have to consult with your orthodontist. You might be able to go back few trays to realign them or they might have to order some additional trays at this time.