Yes, your teeth can start to shift without a retainer in as little as a few days, especially if you recently finished orthodontic treatment. Going without a retainer for 2 weeks may lead to noticeable movement, depending on how long you've been wearing one and how your teeth respond. We recommend wearing a retainer consistently to maintain your alignment. If you’ve lost or broken your retainer, ordering a replacement as soon as possible can help prevent further shifting.
We have our emergency retainers that will arrive in 6-7 business days.
https://sportingsmiles.com/product/em...