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The most you can rotate a tooth just using the aligners is 40 degrees. If you use buttons and elastics then you can rotate 180 but of course your treatment will take longer.
To rotate a tooth 180 degrees, I would not recommend invisalign to be the only treatment modality. Many times I use buttons and elastic thread and different techniques (which are not that noticeable and don't require full braces) to help derotate and align teeth before beginning invisalign. Using these auxillary treatments help to put the tooth in a better position so that invisalign can put it into its final correct position.
In theory it is possible, but it is not practical. First off you would need to use buttons for Invisalign to grip onto. Second, you would have to rotate the tooth with a sequence of trays. Third, you would have to remove the button, retake the Invisalign impressions, place a new button and go through the motions again. I would estimate that you would have to do this 5-6 times to finish. 30 degrees is about the maximum that Invisalign can rotate and still be practical.
It has to fall within the guidelines on the contract. Vivera will only cover a warranty retainer if it has been 6 months or less I believe since your last one was delivered.  If you are currently in treatment then the Dr can order one no problem.
I use a Hawley appliance to move just one or two teeth. You can wear it full time or at night only if you like. I have my patients come in one a month to tighten the springs.
That is built into the aligner and each aligner will be different. The edges are laser polished so they cant get any more smooth. If you think silver brackets and wires would be more comfortable then you should get them. Invisalign is the easiest way to straigten teeth trust me.