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The teeth which are removed are the first premolars. And the aligners can close the gap between 3 to 6 months. The rapid movement at orthodontic treatment can damage your tooth and cause root resorption.
If the space is large it will take a long time since Invisalign moves teeth slowly. Invisalign is better at tipping the tooth rather than moving the whole tooth and root. If the space is big, I ask, why aren't you going with a dental implant to replace the space, or why aren't you enlarging the space to place an if it isn't big enough? If you are already into treatment, this may not be an option anymore, but if you haven't begun, you may be able to plan for an implant. I would look into it.
However, Invisalign can put a fake tooth in the aligner so it looks like you have a tooth there while the gap closes. It can take longer to move a tooth through the bone than keeping it in place and rotating or tipping it, but, depending on how large of a gap you have, it can be accomplished in time.
A nice thing about Invisalign is that it works in a slow and controlled fashion. Teeth that move too quickly can be damaged and lost due to resorption. Invisalign by default moves teeth at about 0.2 mm per aligner, so a bit less than 1/2 mm per month. If you have 14 mm to close, plan on 28-30 months, or 2.5 years. Sometimes the space is not large due to the tooth that was extracted had been pushed out of the way (or crooked), leaving a gap of 8-10 mm, taking 16-20 months.
The major factor determining the cost of any orthodontic treatment, Invisalign or conventional, is how complicated the presenting bite problem is. The more complicated, the longer it will take to correct and thus the more time the orthodontist will devote to the treatment. With Invisalign...
The only thing I would worry about is the possibility that the teeth with veneers on them will be shifted and the gums will no longer cover the veneer margin (the spot where the tooth and veneer meet). This may not be a problem if the margin is not detectable, but if the tooth under the veneer...
Having those teeth removed will not affect the trays you have now nor will it affect results if you are wearing your aligners 24/7. You may need refinement regardless of whether the teeth are removed or not. I usually find with most of my cases I need some refinement near the end of treatment. I...
Round tripping is most commonly seen in the lower anterior crowding situation. Similar to an airline ticket where you start in one city and then return, with Invisalign one is moving teeth away, lining them up, and then returning to the original spot (but rotated or some other improvement)...
It is charged up front, as all the aligners are created at once. This is probably the single biggest drawback to Invisalign, as it is a flat fee and 100% due at the initial onset.
If I am correct, the tooth of which you speak is a lateral incisor. These little rascals can be difficult to reposition with Invisalign since the neighboring teeth are so much bigger and the plastic of the aligners seems to by-pass the laterals in efficiency. But even with this...