You can request a revision from the last aligner(s) that fit well, or (recommended in this scenario) take new impressions and send them in.Run through steps 3-7 above, correcting any of these issues if they apply. Perhaps the teeth or aligner need a little troubleshooting as described above in the case of a 1-2 mm gap.The aligner should eventually seat, once these difficult movements have progressed some.
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