One of the great options when using Invisalign is that they offer something called refinements after all of the initial sets of trays have been worn. The reason for this is to “tweak” the final product. If there are any teeth that have not moved fully into the designated positions, and if desired, your orthodontist can request up to 3 refinements at no extra fee. That is, of course, if you have been treated with the comprehensive Invisalign product. Make certain to ask your orthodontist about the different options that Invisalign offers before beginning your treatment. If a refinement is needed or desired, new impressions or a scan can be taken of your teeth, sent to Invisalign with the requested changes to be made, and shortly thereafter new trays will be sent for you to finalize your treatment and address any concerns. Your orthodontist should discuss the desired changes with you so that all of your concerns are addressed.Many times it is imperative to treat both upper and lower teeth in order to accomplish the changes that are requested. For instance, if a lower front tooth is slightly rotated, it may be necessary to change the position of an upper front tooth slightly in order to move the lower properly. Therefore, it would be necessary for you to wear both upper and lower trays that are active. In the same case scenario, if there is no need to move the upper tooth and the lower tooth can be moved into the proper position alone, Invisalign may send trays that are actively moving the lower teeth and trays that are passive (holding trays) for the upper. Every situation is unique and must be addressed properly so that you receive the best possible outcome.