I have a small crack in upper tray which I need to wear as a passive tray for another 6 months, while completing lower treatment. Can I use superglue to fill the crack - don't have money to pay for another tray. Don't understand why Invisalign will not supply passive trays or make these stronger to preclude cracks when finishing treatments. I am cautious when removing trays, so this crack comes as a surprise to me. Any suggestions would be helpful.
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