How Is the Amount Needed of Invisalign Trays Determined? Is it Determined by the Doctor or Invisalign?

Your dentist is the one who fills out the prescription for your treatment and then Invisalign comes up with the treatment itself, along with the number of trays needed to reach your goal.  Sometimes teeth don't move exactly as the computer simulation expects, like it sounds happened in your case.  Don't worry about your teeth having moved too fast unless you switched your trays out more frequently than every 2 weeks.  Pulpitis can happen just from the teeth moving as well as the bite changing-the sore tooth may be feeling more pressure than it did before.  The fact it calmed down is a good sign, but have your bite checked just in case.

The doctor should decide how many trays are needed.  If the doctor uses Invisalign's Assist program or Express program then Invisalign has more influence over the amount of trays used. The more trays used the slower the movement. Slower movement often increases the control of the movement.

If you and the doctor are not happy with your teeth you might consider a second try using the Case Refinement program.

I really question the pain in the one tooth is caused by rapid movement of your tooth. Since the pain is still there and there is no obvious decay the pain could be caused by clenching on that tooth without you even being aware of the clenching. It may also be too high and you are hitting it first as you bite down further irritating that tooth.

You should not have spaces after Invisalign unless spaces were planned. More aligners can close the spaces.In almost all cases I would not want bonding on my teeth to close spaces. 

Yes, braces are another alternative.

Hi Nana

The Invisalign protocol will only allow for a certain amount of movement per aligner.  The pulpitis could be simply from moving your teeth. 

I must say that it doesn't sound normal to have IPR then to close the space with bonding.  Why remove tooth structure, only to add it back?

Also you should check the aligners and make sure that you have Invisalign and not another clear aligner brand.  There are other copy-cat systems with less restrictive movement limitations (i.e. more movement per aligner set).

Hope this helps.

Best!

Dr. Alper