Keeping your aligners clean is one of those things that sounds simple until you’re three weeks into treatment and wondering why they’ve gone a bit cloudy.
With Invisalign, your aligners sit over your teeth for up to 22 hours a day. During that time, bacteria, plaque, and food particles all accumulate on the surface of the trays. Left unchecked, this creates an environment that’s not great for your teeth or your gums. The whole point of clear aligner treatment is to straighten your teeth discreetly — not to make your dental health worse in the process.
The Basics: Rinse Every Time You Remove Them
This one step makes an enormous difference. Every time you take your aligners out — to eat, to drink anything other than water, or to clean your teeth — rinse them under cool running water. It takes about five seconds and it stops dried saliva and bacteria from building up on the surface.
Not warm water. Cool. Warm or hot water is one of the most common mistakes we see. The plastic in Invisalign aligners is engineered to fit your teeth precisely, and heat warps it. Even water that feels only mildly warm can subtly distort the tray over time, affecting how it fits and, by extension, how well it moves your teeth. The British Orthodontic Society’s guidance on clear aligners is clear on this point: hot liquids and aligners don’t mix.
Cleaning Your Aligners Properly
The simplest effective method is a soft-bristled toothbrush and a small amount of clear, unscented hand soap or mild washing-up liquid. Gently brush all surfaces of the aligner, rinse thoroughly, and you’re done. This should happen at least once a day — most people find it easiest to do it when they clean their teeth in the morning.
You’ll find articles online suggesting toothpaste is fine for cleaning aligners. In our experience, that’s not always right. Many toothpastes contain abrasive particles (that’s what makes them good at cleaning teeth), and those same particles scratch the aligner surface. Scratches create micro-grooves where bacteria settle and, more importantly, they make clear aligners look dull and hazy rather than invisible. Stick to soap.
In our experience, patients who build this habit in the first week of treatment rarely have problems with cloudy or smelly trays. Those who skip it even a few times tend to notice the difference quite quickly.
Soaking: Worth Doing, But Choose Your Solution Carefully
A daily soak in a cleaning solution is a useful addition to your routine. You have a few options. Invisalign produces its own cleaning crystals, which work well. Denture cleaning tablets (the ones designed to fizz in water) are also effective — Retainer Brite is one of the more popular choices. A solution of one part white vinegar to three parts water is another option that some patients prefer for cost reasons.
| Cleaning Method | Effective? | Notes |
|---|---|---|
| Cool water rinse | Yes (basic) | Do this every time you remove the aligners |
| Soft brush and clear soap | Yes | Best daily cleaning method |
| Invisalign cleaning crystals | Yes | Designed specifically for the trays |
| Denture cleaning tablets | Yes | Effective and widely available |
| White vinegar soak | Yes | 1:3 ratio with water; rinse well after |
| Toothpaste | No | Too abrasive; scratches the plastic |
| Mouthwash | No | Coloured varieties stain aligners |
| Hot water | No | Warps the plastic and ruins the fit |
Soak for about 20 to 30 minutes, then rinse and brush lightly before putting them back in. You don’t need to soak for hours. Actually, soaking too long in some solutions can leave an aftertaste or, with certain products, cause minor surface damage.
Your Own Teeth Matter Just as Much
This part gets overlooked. Cleaning your aligners is only half the equation. If you put a clean aligner back onto teeth that haven’t been brushed, you’re trapping bacteria between the tray and the tooth surface for up to 22 hours at a stretch. That’s not a good environment for your enamel.
The routine should go: remove aligners, eat, brush and floss thoroughly, then replace aligners. That sequence. Not remove, eat, rinse and replace. The brushing step isn’t optional.
We had a patient who came in about six months into her Invisalign treatment. She was doing beautifully with her aligner wear time, diligently keeping them in for the recommended hours, but she’d developed some early demineralisation on a couple of teeth. When we talked through her routine, it turned out she was often putting her aligners back in without brushing, particularly after lunch at work. Just building in that one extra step — keeping a travel toothbrush at her desk — was enough to stop any further development. She finished treatment with healthy teeth and a great result.
Eating and Drinking: Non-Negotiable Rules
Remove your aligners before eating anything. Every time. No exceptions. Eating with aligners in doesn’t just risk breaking or warping the trays. Food gets forced into the gaps between the plastic and your teeth, and even a light snack leaves residue that’s difficult to clean out properly. Sugar trapped against the tooth surface under a tight-fitting tray is a fast route to decay.
Drinking is slightly more nuanced. Plain water is fine at any temperature, within reason — very hot water is still a risk for warping. Anything else — coffee, tea, juice, fizzy drinks, alcohol — should only be consumed with your aligners out. Coloured drinks stain the plastic. Sugary drinks feed bacteria. And hot drinks, as already mentioned, can affect the fit.
Storing Aligners When They’re Not In
When your aligners come out, they go in the case. This is one of those pieces of advice that seems obvious but is apparently not followed as often as you’d hope. Aligners left on a table, wrapped in a tissue, or placed on the edge of a sink get lost, damaged, or contaminated. The case exists for a reason.
Keep the case clean too. Rinse it regularly. In our experience, a case that’s never cleaned becomes a source of contamination for aligners that are otherwise being cared for well.
What to Do If Your Aligners Have Already Gone Cloudy
A longer soak in cleaning solution — somewhere between one and two hours — can help lift light discolouration. Repeat soaking over a few days sometimes improves things noticeably. Significant yellowing or grey discolouration tends not to reverse fully, though. That said, each set of Invisalign trays is typically worn for a week or maybe ten days before moving to the next, so even a tray that’s started to discolour gets replaced fairly soon.
If you’re having ongoing trouble with your aligners or want a proper check on how your treatment is progressing, come and see us. At Westcliff Dental Practice we’re happy to answer questions, review your routine, and make sure everything is on track. Give us a ring on 01702 344 500 and we’ll sort something out.
