Whenever we have to compress lower arch transversally (e.g. to help solving a posterior crossbite), we have to make sure: 1st) there is enough space so teeth can move, for what IPR is strongly recommended in between teeth to be compressed 2nd) patient wears criss cross elastics to support movement (this will also help with posterior expansion, which should be planned simultaneously) 3rd) if possible, distalise tooth has to be set as unmovable to create anchorage 4th) add extra lingual root torque (10-15º) and, if possible, cervical insets on buccal side with an aligner detailing plier (horizontal shaped) manually on every aligner whilst this extra LRT is planned on CC.

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