Aligner chewies are small cylinders of soft, dense foam that you bite on for a few minutes after inserting an Invisalign tray so it seats fully against your teeth. Trays only work when worn 20–22 hours a day and properly seated; a tray that is not fully down can stop teeth tracking and lead to refinement rounds that some Australian practices charge $300–$800 for in 2026.
Most Australian Invisalign providers hand over a small bag of chewies with the first set of trays and a quick instruction to use them. Then people forget. That is a pity, because chewies are the cheapest, simplest thing you can do to keep a case on schedule, and a case that drifts off plan can cost real money in extra aligners.
This guide explains what chewies do, how to use them properly, when they matter most and what to do if you lose yours. It is general information; your dentist or orthodontist’s instructions for your case take priority.
What aligner chewies are
Chewies are short cylinders of dense, slightly springy foam, usually 2–3 cm long, that you bite on while wearing an aligner. The foam compresses under your bite and pushes the tray evenly down over the teeth. Align Technology does not make a branded chewie for Invisalign; the generic foam rolls sold at pharmacies, dental practices and online do the job, and so do products sold as aligner seaters or aligner bites.
They come in a few shapes. The classic cylinder is the most versatile. Flat or wedge-shaped seaters give a broader surface for molars. Some newer versions are silicone with a handle, which is easier to hold and clean. Scented ones are a novelty, not a benefit.
Why seating matters
Invisalign moves teeth because each tray is shaped slightly ahead of where the teeth are. It can only push a tooth if the plastic is in close contact with it. When a tray sits a millimetre high over a tooth, that tooth receives no force, and over a one- or two-week wear cycle it falls behind the plan. The next tray then fits worse, and the gap grows.
Providers call this tracking. A tray that is not tracking shows a visible space between the plastic edge and the tooth, often at a canine or a tooth with an attachment. If it goes on for several trays, the practice has to re-scan and order refinement aligners. Comprehensive packages include unlimited refinements for five years, but Express packages may include only one, and some Australian practices charge $300–$800 for extra rounds. Wearing trays for the full 20–22 hours a day and seating them properly are the two things you control.
Chewies also help with comfort. Biting evenly across a new tray spreads the pressure, and the massage effect eases the dull ache of the first day or two.
How to use Invisalign chewies
- Insert the tray with your fingers. Push it over the front teeth first, then the back teeth on both sides, until it clicks. Never bite a tray into place from scratch; chewies finish the job, they do not start it.
- Place the chewie between the teeth at the front and bite down firmly for 3–5 seconds. Release.
- Work backwards. Move the chewie along one side to the premolars, then molars, biting and holding at each spot. Then do the other side.
- Check in the mirror. Look for gaps at the edges of the tray, particularly around attachments. Repeat on any tooth that is not fully covered.
- Do a full session two or three times on a new tray day, about 5–10 minutes each. Short sessions through the week are enough once the tray is seated.
- Rinse the chewie and let it dry.
| Moment | What to do | How long |
|---|---|---|
| New tray day | Seat the tray with fingers, then chew section by section, front to back, both sides | 5–10 minutes, two or three times that day |
| Each re-insertion (after meals, brushing) | Push tray on with fingertips, then a short chew to close any gap | 1–2 minutes |
| Tray feels tight or lifts at the back | Chew on the affected side only, holding the bite for a few seconds each time | 2–5 minutes, repeat later |
| Visible gap at the edge of a tooth after a day | Chew on that tooth several times a day; if the gap persists 2–3 days, call your provider | Ongoing until seated |
| Attachments feel like they are not engaging | Chew across the attachment side; do not force the tray with fingernails | 2–5 minutes |
Do not use chewies to force a tray that will not go on. If a new tray will not seat after a couple of sessions, go back to the previous tray and contact your provider. Forcing it can crack the plastic or loosen an attachment.
When chewies matter most
- The first day of every new tray. This is when the plastic is furthest ahead of your teeth and most likely to sit high.
- After any long break. Trays come out for meals, coffee and brushing. After a longer gap, such as a dinner, teeth can shift slightly and the tray needs re-seating.
- Teeth with attachments. The tray has to lock over the attachment to apply the planned force. These are the spots that most often show a gap.
- Rotations and extrusions. If your ClinCheck involves turning a canine or pulling a tooth down, your provider may tell you to chew on that tooth daily.
- If you have been told you are not tracking. Chewies plus full wear time are the standard first fix before refinements.
Buying chewies in Australia, and alternatives
Your provider will usually give you a few to start and sell or give replacements at review visits; ask before you buy elsewhere. Pharmacies, Chemist Warehouse and online retailers stock generic aligner chewies and seaters in multi-packs, and they are inexpensive relative to anything else in Invisalign treatment. Prices vary by brand and pack size, and we have not found a published Australian price list to quote, so check the retailer page before ordering.
Chemist Warehouse
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If you run out, a clean rolled-up piece of a cotton gauze pad or a folded clean face washer corner works for a day or two. Avoid biting on pens, fingernails or hard objects; they concentrate force on one point and can crack a tray. Do not use chewing gum, which sticks to the plastic.
Chewies are a seating tool, not a treatment device. They do not speed up tooth movement beyond what the plan allows, and chewing for longer than a few minutes at a time gains nothing. Products that claim to accelerate Invisalign are a separate category with mixed evidence; talk to your provider before buying one.
Care and hygiene
Rinse chewies under the tap after each use and leave them to air dry. Wash them with mild soap every few days. Foam chewies gradually lose their spring and pick up bite marks; replace them when they feel flat, usually every one to two weeks of regular use. Silicone versions last longer and can go in the dishwasher.
Keep a chewie with your aligner case rather than loose in a pocket or bag, where it collects lint. If one has been dropped on the floor, wash it before it goes back in your mouth. For the trays themselves, see our aligner and retainer cleaner review.
Chewies are a small part of a bigger routine: 20–22 hours of wear, trays changed on schedule, attachments intact and reviews kept. If you are doing all that and still see gaps, that is a conversation for your dentist or orthodontist, not something to fix with harder chewing. Our Invisalign hub covers the full treatment journey, and the cost guide explains what refinements and retainers can add.
Common questions
What are Invisalign chewies for?
Chewies are soft foam cylinders you bite on after inserting an aligner so the tray seats fully over every tooth, including attachments. A tray that sits even slightly high cannot apply the planned force, and teeth fall behind the plan. Regular chewing, especially on new-tray days, helps teeth track and reduces the chance of needing refinement aligners.
How long should I use chewies each day?
On the first day of a new tray, chew for about 5–10 minutes, two or three times. On other days, a minute or two after each re-insertion is enough, plus a few extra minutes on any tooth where the tray looks high. Longer sessions do not move teeth faster; the aligner does the work, chewies just close the gap.
Do I really need chewies with Invisalign?
Not strictly, but they are the simplest way to keep trays seated and are widely recommended by Australian providers. Without them, gaps at attachments and canines are more common, and persistent gaps lead to refinements that Express packages may not include. Given how little they cost relative to a $300–$800 refinement round, most people should use them.
Where can I buy aligner chewies in Australia?
Ask your dentist or orthodontist first; most supply a starter pack and replacements at reviews. Otherwise, pharmacies, Chemist Warehouse and online retailers stock generic aligner chewies and seaters in multi-packs. Prices vary by brand and pack size, so check the retailer listing. Any dense foam aligner chewie works with Invisalign; a branded product is unnecessary.
Can chewies damage my aligners or attachments?
Used normally, no. Problems come from forcing a tray that does not fit, biting on hard objects instead of foam, or using fingernails to pry the plastic over an attachment, which can crack the tray or dislodge the attachment. If a new tray will not seat after a couple of chewie sessions, go back to the previous tray and call your provider.
Sources & methodology
- Invisalign Frequently Asked Questions — Smile Solutions (source), 2026
- Invisalign Australia Review — NewMouth (source), 2025-01-30
- Invisalign Cost in Melbourne: 2026 Price Guide — Aesthetik Dental (source), 2026-08-03
- Invisalign Brisbane — Wickham Terrace Dental (source), 2025-09-01
- How Invisalign works — Invisalign Australia (Align Technology) (source), 2026
General information, not personal advice. Prices are indicative and change; always get a written quote. Editorial policy · Disclaimer