What to Do With Old Invisalign Trays: Keep, Reuse, or Toss?

Oct 14, 2025

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What to Do With Old Invisalign Trays: Keep, Reuse, or Toss?

If you’re wearing Invisalign trays in Mississauga, there’s a good chance you’ve paused mid-cleanup, wondering what to do with that growing stack of old aligners. Are they worth keeping? Can they be reused? Should they be tossed? The answers aren’t always obvious, and making the wrong call can affect your treatment progress or put your oral health at risk.

At Bristol Dental Clinic, we help patients take the guesswork out of aligner care. From the first fitting to the final tray, we guide you through every phase of treatment, including what to do when you’re done with an aligner.

Whether you’re midway through Invisalign or approaching the final stretch, here’s what you need to know about managing your trays.

What Are Invisalign Trays and Why Do You End Up With So Many?

Invisalign trays are custom-designed plastic aligners made to move your teeth in small, controlled steps. Each new tray slightly adjusts the alignment based on your treatment plan, which means you’ll change trays every one to two weeks. Most patients go through 20 to 40 sets of aligners before reaching the final result.

That adds up quickly. In just a few months, it’s easy to accumulate a drawer full of old aligners. While it may be tempting to toss them out, some trays still serve a purpose.

What to Do With Old Trays After Treatment Ends

When treatment wraps up, most of your aligners can be discarded, but not all of them.

Your last set of trays is worth keeping. If you experience delays in receiving your retainers or lose them unexpectedly, these final trays can help maintain your alignment temporarily.

Store this final set in a clean, hard plastic case. Keep it somewhere cool and dry to prevent bacterial growth or plastic warping.

Should You Ever Reuse Old Invisalign Trays?

We often hear the question: Should I keep old Invisalign trays in case I need them later? The answer is yes, but only to a point.

Reusing trays from earlier in treatment is not recommended. Doing so can:

  • Apply pressure to teeth that are no longer in that position
  • Cause discomfort or even reverse progress
  • Lead to misalignment if used without supervision

If you’ve lost a tray or think you need to backtrack, contact Bristol Dental Clinic. Our team can review your progress and determine the safest option.

Invisalign Tray Storage Tips: Clean and Safe Practices

Proper storage isn’t just about avoiding mess. Dirty, cracked, or improperly stored trays can also pose a health risk. Here’s how to care for your trays:

  • Clean before storing: Soak trays in a white vinegar solution or use denture-cleaning tablets. Gently scrub with a soft toothbrush and rinse thoroughly.
  • Let them dry: Moisture encourages bacterial growth, so dry trays completely before putting them away.
  • Use a secure case: Avoid tissue or plastic bags. Use a labelled hard case to prevent damage and confusion.

Are Invisalign Trays Recyclable or Eco-Friendly?

Concerns about sustainability are coming up more often among Invisalign patients, especially considering how many trays get used. These aligners are made from medical-grade thermoplastic, which, unfortunately, isn’t recyclable through standard curbside programs. That means most used trays still end up in regular household waste.

Still, there are a few easy ways you can lower your environmental impact. Stick to your treatment schedule, and try not to switch trays early unless your orthodontist in Mississauga recommends it.

Only hang on to trays that serve a clear purpose, like your final set or a backup for emergencies. If you’re not sure what to do with old trays, you can check in with Bristol Dental Clinic, and we’ll let you know how to manage disposal.

Invisalign Treatment in Mississauga Starts With Smart Tray Habits

Tray management might not seem like a major decision, but how you handle your Invisalign trays can shape the outcome of your treatment. Staying organized, knowing when to keep trays, and understanding when to let them go all contribute to a smoother, more effective path to your ideal smile.

If you’re looking for expert advice and support throughout your Invisalign treatment journey in Mississauga at Bristol Dental Clinic, you’ll receive clear guidance every step of the way. Our team is here to make sure you’re confident in your care, trays and all.

Learn more about Invisalign treatment in Mississauga, or reach out to Bristol Dental Clinic today at 866-673-2109 or click here to get in touch online.

Invisalign Tray FAQs

Can I wear an old Invisalign tray if I skipped one?

No. Skipping trays without guidance can harm your progress. Always consult your orthodontist first.

How long should I keep old aligners after Invisalign?

You can dispose of most trays a few weeks post-treatment. Keep your last set in case of retainer loss or delays.

What’s the best way to store my trays?

Labelled hard cases stored in a dry, cool location are best. Avoid moisture and direct heat.

Can I travel with backup trays?

Yes. Pack your current tray, previous tray, and next tray (if available). Keep them in their cases and store in your carry-on.

Will I ever need my old trays again?

It’s possible, especially the final tray. Earlier trays are rarely reused.

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