Invisalign has made orthodontic treatment easier for thousands of patients, but it also adds a new layer to your daily routine, one that old flossing habits don't always account for. If you're new to aligners, flossing probably looks a little different now. It requires you to remove your trays, floss around each tooth, and pop your aligners back in several times a day. Simple in theory, but this extra step causes most patients to slip up.
Since aligners cover your teeth for 20+ hours a day, rushing through flossing, skipping sessions, or sticking to old habits can trap food particles and bacteria against your teeth for hours. Left undisturbed, that trapped plaque can lead to gum irritation and even cavities, sometimes without you noticing until your next checkup.
Here are the 5 most common flossing mistakes we see in Invisalign patients, and how to fix each one.
1. Only Flossing Once a Day
Every time you remove your trays for a meal or snack, food particles get pushed against your teeth once the aligners go back in. If you only floss once a day, or not at all, whatever built up earlier in the day sits trapped for hours, giving plaque more opportunity to build up along the gumline, even if you technically "floss every day."
How to fix it:
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Floss each time you remove your aligners for a meal or snack, not just once before bed.
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Keep travel floss (the Slate Mini Flosser is perfect for this) or floss picks with you so it's easy to floss on the go, at work, in the car, or wherever your trays come out.
2. Flossing Too Aggressively
Flossing harder will not give you cleaner teeth. Snapping floss forcefully between your teeth can irritate or injure your gums, especially if you've recently switched to a new aligner tray and your teeth feel more sensitive.
How to fix it:
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Gently guide string floss between your teeth, curving it into a "C" shape around each tooth before moving it up and down. If you’re using a Slate flosser, use their roll & sweep technique.
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If your gums bleed slightly when you start flossing regularly, keep going. Healthy gums typically become less sensitive as plaque buildup decreases.
Learn Slate’s roll & sweep technique
3. Skipping Flossing Because Brushing Seems Enough
Brushing alone doesn’t do enough for plaque control. Yes, it cleans the surfaces of your teeth, but it can’t reach the tight spaces between them. You need to floss for that.
If you skip flossing, food particles stay trapped between your teeth before your aligners go back on, creating a warm, enclosed environment where bacteria multiply fast. Over time, that raises your risk of cavities, gum inflammation, and bad breath, all things that can interfere with your treatment.
How to fix it:
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Make flossing part of your daily routine, ideally before placing your aligners back in after your last meal of the day.
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Invest in products that make flossing feel easier, whether that’s an electric flosser like Slate, a water flosser, or just a new package of your favorite string floss.
4. Forgetting to Clean Your Aligners
Even perfectly clean teeth can pick up bacteria and plaque if you put them back into dirty aligners. Cleaning your aligners regularly seems intuitive, but it’s easy to forget or procrastinate. Skipping it has very real consequences and can leave your trays cloudy or with a foul odor.
How to fix it:
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Rinse your aligners every time you remove them, and clean them daily using the method your orthodontist recommends.
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Skip hot water, since excess heat can warp the plastic and affect the fit. Use lukewarm water, a soft-bristled toothbrush, and liquid soap to clean.
5. Not Matching Your Floss to Your Routine
Since Invisalign means flossing several times a day, the type of floss you use matters, both for your teeth and for how sustainable the habit actually is. String floss is effective, but can feel cumbersome if you’re struggling to wrap floss around your fingers and reach between your back teeth several times a day.
That’s where Slate's reusable floss heads fit well into an aligner routine. Their woven floss is durable and grabs onto more plaque than general string floss. And because each head can be rinsed and reused for about a week, it's a low-effort way to keep flossing consistent without going through a pile of disposable floss or floss picks every day.
Slate’s key benefits:
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Woven floss and gum brushes disrupt more plaque and stimulate the gums each time you floss.
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Sonic vibrations make flossing more effective with less effort, meaning you can feel confident your teeth are actually getting clean.
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Designed to be rinsed and reused for about a week, cutting down on daily waste.
Build Better Flossing Habits for a Healthier Smile
Good flossing habits take only a few extra minutes a day, but those minutes make a lasting difference, especially during Invisalign treatment. Avoiding these common mistakes and cleaning your teeth, gums, and aligners consistently helps keep your treatment on track and your smile healthy.
Successful Invisalign treatment isn't just about wearing your aligners consistently. It's also about keeping everything around them clean.
Make flossing easier with Slate
Author Bio:
Dr. Ravi Patel, DMD, is committed to providing high-quality, patient-centered care. He earned his Doctor of Dental Medicine degree from Tufts University School of Dental Medicine and focuses on delivering precise, comfortable, and effective treatments.
Dr. Patel is passionate about continuous learning and staying updated with the latest advancements in dentistry. At Coral Dental Care, he aims to help patients achieve healthy, confident smiles while also sharing valuable insights on oral health and modern dental care.
