Interdental hygiene - floss vs. interdental brushes vs. oral irrigator
If you’re dealing with bleeding gums, bad breath, braces, implants, or you simply want to be sure you’re cleaning your teeth really thoroughly, the answer is almost always the same: interdental hygiene. A toothbrush cleans the tooth surfaces, but the interdental spaces are a completely different “world” - and that’s exactly where plaque most often lingers, causing gum inflammation and unpleasant breath.
Below you’ll find a clear comparison of dental floss, interdental brushes and devices like an oral irrigator / water flosser - including how to use an interdental brush, how to use dental floss, how to choose the right interdental brush sizes, and what to do when “the brush won’t fit”.
Why a toothbrush alone isn’t enough and what happens between teeth?
Between teeth there are tight contacts and gumline “folds” where a regular toothbrush often doesn’t reach. If plaque remains there, the body reacts with inflammation: gums become sensitive, bleed easily, and bad breath often appears. Practically, if you brush only with a toothbrush, it’s like washing a plate but skipping the edges and folds. Interdental hygiene is the detail work that makes the difference.
How to use dental floss and when is floss the best choice?
Dental floss is ideal especially when you have very tight interdental spaces and an interdental brush doesn’t fit yet. It also works great at the “point” contact between teeth, where plaque likes to stick.
How to use floss (briefly but correctly):
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Cut about 30-40 cm of floss and wind it around your fingers.
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Insert the floss gently (no “snap” into the gum).
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Curve the floss into a C shape around the tooth and make several up-and-down strokes along the tooth surface.
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Repeat the same on the neighboring tooth within the same contact.
Limits: with larger interdental spaces (or gum recession) floss often doesn’t clean the space as volumetrically as an interdental brush - in such cases brushes tend to be more practical and effective.
We recommend:
How to use an interdental brush and how to choose the right size?
For many people, interdental brushes are the best choice because they can literally “sweep” plaque out of the space. They’re especially practical with bleeding gums (early inflammation), with braces, around implants and bridges, and with larger interdental spaces after gum recession.
Basic rule for selection: the brush should pass through with slight resistance, shouldn’t hurt, and you must never force it.
How to determine brush sizes (even if you want the thinnest brushes)?
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Start with what’s often searched as the thinnest interdental brushes, and move up gradually as needed.
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The right size is the one where the brush passes the contact with gentle resistance and “rubs” the tooth walls, but doesn’t bend forcefully.
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It’s common that different contacts need different sizes - e.g., smaller in the front and larger in the back.
What to do if the brush won’t go between the teeth?
If the brush doesn’t fit, don’t force it. In tight contacts the right solution is often dental floss. Elsewhere try a smaller size or a different shape. It’s perfectly normal to use floss in some places and brushes in others - it’s not a mistake but an adaptation to your tooth anatomy.
Try, for example:
- Interdental brushes round 0.4 mm - Nordics
- Thinnest interdental brushes from recyclable bioplastic, 0.4 mm - Nordics
What is an oral irrigator (water flosser), when does it help, and where are its limits?
An oral irrigator (people often search for it as a water flosser) is great for rinsing out food debris and for hygiene around braces, implants, or harder-to-reach areas. It can also help if you’re dealing with bad breath and want to reduce the amount of debris and biofilm in the mouth.
However, keep in mind that a water flosser does not replace mechanical cleaning. Plaque is a “sticky film” that is most reliably removed mechanically - i.e., with an interdental brush or dental floss. An irrigator is therefore an excellent add-on, not the only step.
We recommend:
How to combine floss, interdental brushes and an irrigator into one routine?
The simplest decision guide looks like this:
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Tight contacts → dental floss
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Spaces where a brush fits → interdental brush (often the most effective solution)
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Braces/implants + frequent food trapping → add a water flosser (oral irrigator)
Practical evening routine (2-4 minutes):
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First, use interdental brushes where they fit.
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In tight spots, add dental floss.
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Then brush your teeth with a regular toothbrush and toothpaste.
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Use the irrigator as needed (e.g., with braces or when food often gets trapped).
Why do my gums bleed during interdental cleaning, why does it hurt, or why do I feel I’m doing it wrong?
The most common situations and solutions:
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Bleeding gums: most often it’s inflammation from plaque. When you start cleaning thoroughly, the gums may bleed even more for the first few days, then it should gradually improve (often within 7-14 days). If bleeding doesn’t improve or worsens, consult a dental hygienist or dentist.
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Pain: usually related to a brush that’s too large, too much pressure, or incorrect insertion. Choose a smaller size, slow down, and work gently.
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“It doesn’t fit”: common in tight contacts. There, the best choice is often dental floss.
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Bad breath despite cleaning: often a combination of interdental plaque, tongue, and gum inflammation. Consistent interdental hygiene is the foundation; if the problem persists, have your gums and tartar checked.
If you like, I can also prepare a short “mini test” (5 questions) at the end of the article to help the reader quickly decide whether to start with dental floss, an interdental brush, or whether it’s worth adding an oral irrigator.
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