Back teeth are moving back to original position with Braces on front six teeth. Any suggestions?

After 16 months of Invisalign for numerous issues including widening my arches, I had braces applied to my top front six teeth to help move my lateral incisor into position. It is one week after the braces have been applied and my top back teeth have moved out of position, narrowing the arch so that they are hardly visible when I smile. My orthodontist is on holiday; another one can't seem me for another week's time. Is there anything I can do to stop further movement? What options will I have?

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