Lost or Cracked an Aligner? Here's Exactly What to Do Next

First, take a breath

The short version: one damaged or missing tray is a routine, solvable situation.

Clear aligners are working plastic. They're removed several times a day, handled at meals and packed into bags, so a fair number of people lose or crack one somewhere along the way. That doesn't mean your treatment is broken. It means you need to do two simple things: keep your teeth from drifting out of position, and get clear instructions from the team supervising your care.

Just as important is what not to do in the heat of the moment. Don't reach for glue. Don't skip forward to a future tray to "make up time". And don't leave your teeth with no aligner in at all for days on end. Each of those can turn a small problem into a bigger one.

If you've lost an aligner

The fact: the sooner you act, the less chance your teeth start to shift.

A lost tray is the most common aligner emergency, and there's a clear order of moves that keeps things under control:

1. Retrace your last few hours. Most trays go missing at mealtimes, when they're taken out and set down. Check tables, bags, jacket and trouser pockets, the car and bedside table before you assume it's gone for good.
2. Put your previous set back in. If you've kept your last aligner — and you always should — wear it now. It holds your teeth where they are so nothing drifts while you wait.
3. Don't jump ahead to your next set. Teeth move in planned stages. Skipping to a future tray can mean a poor fit, soreness and movement you didn't want. Only move forward if your provider tells you to.
4. Message the Smileie team. Tell us which aligner number is missing so we can advise you and arrange a replacement quickly.
5. Keep an aligner in as much as you can until the replacement arrives. Wearing the set your provider recommends still counts toward keeping your teeth in place.

Where lost trays usually turn up

Before you write it off, a quick look in the usual hiding spots often saves the day:

• Wrapped in a serviette at a café or restaurant — then cleared into the bin.
• A hotel bedside table, gym bag or the side pocket of a handbag.
• A coat or jacket pocket from a change of weather.
• Somewhere a curious toddler or pet decided to investigate.

If you've cracked or broken an aligner

The fact: whether you can keep wearing it comes down to how bad the damage is.

Not all breakages are equal. A hairline crack behaves very differently from a tray that has snapped in two, so it helps to know which situation you're in.

One rule applies to every breakage: never try to repair an aligner with household or super glue. Those glues aren't food-safe, they can be toxic in the mouth, and a patched tray won't fit the way it needs to anyway. The safe fallback is almost always the tray you were wearing before.

Previous set or next set? The one decision that matters most

The fact: when in doubt, go back a step, not forward.

This is where people most often go wrong. The instinct is to leap ahead to the next tray so you "don't lose any time". Resist it. Your current aligner completed a specific stage of movement, and the next one is calibrated to begin exactly where that stage ended. Move ahead too early and the new tray may not seat properly, which can cause pain and tracking problems that take longer to fix than the original issue.

The standard, safe move is to wear your previous set to maintain your position, then pick your schedule back up once the replacement tray arrives. Because every plan is different, always confirm with the team supervising your treatment — they can see your case and tell you whether to hold, replace or adjust.

For a refresher on how the change schedule normally works, see our guide to how often you should change clear aligners.

Getting a replacement from Smileie

The fact: a quick message to support is all it takes to start the process.

You don't have to work this out alone. Here's how a replacement typically comes together:

1. Contact the Smileie team with your name, order details and the aligner number that's lost or damaged.
2. Send a photo if we ask. A quick picture of the damage — or of your teeth in your current tray — helps the dental team give the right advice.
3. We confirm the fix. That's usually a replacement of the same tray, or guidance to move to the next set if you're ready.
4. Keep an aligner in meanwhile. Wear your previous set unless you're told otherwise.
5. Resume your schedule once the replacement lands.

Any timeframes, replacement conditions or fees can depend on your plan and the situation, so it's worth checking your plan details or simply asking us. If you're not sure how your treatment is structured, our overview of how Smileie treatment works is a helpful place to start, and you can review inclusions on the pricing page.

Will this delay my treatment?

The fact: a short wait is usually minor — as long as you keep an aligner in.

A day or two spent waiting on a replacement, while wearing your previous set, generally has little effect on your finish date. The delays that actually add up come from two habits: going for days with no aligner at all, or forcing in a new tray that doesn't fit. Steady, consistent wear is what keeps your timeline on track.

For more on how daily wear shapes your results, read our guide to aligner wear time, cleaning and common mistakes. And if your teeth feel tight for a day or so once the replacement is in, that can be a normal part of settling back in — our guide to aligner pressure and discomfort explains what to expect.

How to avoid losing or breaking a tray again

The fact: almost every lost-aligner emergency traces back to one skipped habit.

A few small routines take the drama out of aligner life:

• Always use your case. Never a serviette, a pocket or a bare table. Casing your trays whenever they come out prevents most losses full stop.
• Keep every previous set, labelled and stored, so you've always got a backup on hand.
• Remove and insert evenly. Ease trays off from both sides rather than yanking from the back, which is where most cracks start.
• Never eat or chew gum with trays in. Bite force is a leading cause of breakages.
• Keep them away from heat. Hot water, a sunny car dashboard and the dishwasher all warp and weaken the plastic.
• Clean gently. Skip boiling water and abrasive toothpaste, which scratch and cloud the trays.
• Pack a travel kit. A spare case in your bag and car means you're never stuck at a meal without one.

Common questions

• Can I still wear a cracked aligner?Often yes, if it still fits cleanly and has no sharp edges — as a short-term stopgap while a replacement is arranged. Stop using it if it cuts your mouth or no longer seats properly, and check with your provider.
• Can I skip to my next aligner if I lost one?No. Don't advance early on your own. Wear your previous set to hold your teeth in place and ask your provider first. Jumping ahead can cause pain and poor tracking.
• How long can I go without wearing an aligner?As little time as possible. Even a day or two with nothing in can let teeth begin to drift, so wear your previous set to maintain your position until a replacement arrives.
• Can I glue a broken aligner back together?No. Household and super glues aren't food-safe and a repaired tray won't fit correctly. Use your previous set instead and contact us for a replacement.
• What if I've lost the aligner and my previous set?Get in touch with Smileie promptly. The team can advise the safest interim step for your case and arrange a replacement.
• How much does a replacement aligner cost?It depends on your plan and the situation. Contact our support team to confirm what applies to you before assuming a cost.

This article provides general information, not individual dental advice. Aligner suitability, replacement needs, risks and treatment time vary from person to person. A dentist or orthodontist should assess your teeth, gums and bite and supervise your care.