You open your case and it's empty, or you hear a crack. Don't panic. Losing or breaking an aligner is common, and there's a standard way to handle it.
Step 1: don't go without aligners
The main risk is your teeth drifting while nothing is holding them. Get a backup aligner in as soon as you can while you sort out a replacement.
Step 2: contact your orthodontist
Tell them which aligner number you lost or broke and how many days you've worn it. They'll tell you what to wear next and whether to order a replacement.
Step 3: wear the right backup
Typical guidance, which your provider may adjust:
- Early in the current tray: go back to your previous aligner until the replacement arrives.
- Near the end of the current tray: you may be told to move to your next aligner early.
Whichever you wear, check the fit carefully. If it doesn't seat fully, tell your provider. See what to do when aligners don't fit.
If your aligner is cracked or broken
- Small crack, still fits, no sharp edges: ask your provider if you can keep wearing it for now.
- Sharp, split, or loose: stop wearing it and switch to your backup.
- Don't try to glue or trim it.
How to avoid losing aligners
- Case, never napkin. Most lost aligners are thrown away with a napkin at a restaurant.
- Keep backups. Save your last one or two used aligners in a labeled bag at home.
- Keep them away from pets. Dogs love chewing aligners.
- Carry a spare case in your bag or car.
- Use a removal reminder, so aligners don't sit forgotten on a table.
Keep your schedule straight
A lost aligner shifts your dates. Note when you started the backup or replacement so your change schedule stays accurate. A tracking app can record the actual change date and recalculate the rest.
Track it instead of guessing
TrackMyAligners logs your wear time with one tap, reminds you when aligners are out too long, and tells you when to switch trays. Free on iPhone.
The bottom line
Call your orthodontist, wear the backup they recommend, check the fit, and get back on schedule. Next time, the case goes everywhere with you.
Frequently asked questions
Should I wear my previous or next aligner if I lose one?
Ask your orthodontist. Commonly, if you're early in the current tray you go back to the previous one; if you're near the end, you may be told to move to the next. Don't skip ahead without their okay.
Can I wear a cracked aligner?
A small crack may be wearable for a short time if it isn't sharp and the aligner still fits, but check with your provider. Stop wearing it if it cuts your mouth or no longer holds your teeth.
How long does it take to get a replacement aligner?
It depends on your provider and brand. Replacements are made from your treatment plan, so it's often days to a couple of weeks. Wear your backup aligner in the meantime.
Does losing an aligner cost money?
Some treatment plans include replacements and some charge for them. Ask your provider.
This guide is general information, not medical advice. Your orthodontist or dentist knows your case, so follow their instructions if they differ from anything here.