Why Does Floss Stink? What It Means for Your Gums
Almost everybody has pulled out a piece of floss and given it a sniff. Almost nobody admits it. Here is what that smell actually is, and the point where it stops being normal.
Floss stinks because it pulls out plaque and bits of food that bacteria have been breaking down between your teeth, in the one spot a toothbrush cannot reach.
Cleveland Clinic describes bad mouth odor as the work of bacteria, and the NHS says regular flossing can reduce bad breath by removing the plaque that forms along the gum line. The smell on the floss is that plaque, on its way out.
A faint smell now and then is normal. A strong smell from the same spot every time, or a smell that comes with bleeding gums, is worth having a dentist look at. That combination is how gum disease tends to announce itself.
Read the Floss
What the Smell on Your Floss Is Telling You
General guidance drawn from the NHS pages on flossing, bad breath and gum disease. It is a starting point, not a diagnosis. An exam is the diagnosis.
| What you notice | What it usually means | What to do |
|---|---|---|
| A faint smell, no bleeding | Normal. Plaque and food residue build up between teeth over the day, and the floss is removing them. | Keep going. The NHS advises cleaning between your teeth at least once a day. |
| A strong smell from one spot, every time | Something there is holding onto food: a tight contact, a gap, the edge of an old filling, or a cavity. The NHS lists holes in teeth and infections among the causes of bad breath. | Have that tooth checked. A spot that smells every single time rarely sorts itself out. |
| Smell plus bleeding when you floss | Gums that bleed when you brush or floss are a listed symptom of gum disease, and so is bad breath. | Book a checkup and cleaning, and keep cleaning gently in the meantime. |
| Smell plus a bad taste, or swollen, sore gums | The NHS lists bad breath, a bad taste in the mouth and swollen, sore gums as symptoms of gum disease. | See a dentist rather than waiting it out. |
Bleeding Is Not a Reason to Stop Flossing
Gums that bleed are tempting to leave alone. The NHS advice on gum disease runs the other way: clean between your teeth every day, and see a dentist for regular checkups. Painful, bleeding or swollen gums are on its list of reasons to book one.
The Fix
How to Make Your Floss Stop Smelling
Smelly floss almost always comes down to plaque that has had too long to sit. These are the habits the NHS recommends for getting ahead of it.
- Floss once a day, every day. The NHS recommends cleaning between your teeth at least once a day. Skipping a few days gives plaque the time it needs to build up.
- Use the C-shape. The NHS describes curving the floss into a C-shape around each tooth and gently sliding it up and down to remove food and plaque.
- Try interdental brushes if you have gaps. The NHS lists interdental brushes as an alternative to floss, especially where there are gaps between teeth.
- Clean your tongue, too. The NHS suggests gently cleaning your tongue once a day with a scraper or cleaner, and Cleveland Clinic notes that bacteria and food debris hide there.
- Get a professional cleaning. A cleaning reaches buildup at and below the gum line that home care leaves behind. Our hygiene and periodontal services are where that happens.
Mouthwash helps with the smell for a while, but the American Dental Association is clear that a rinse does not take the place of brushing and flossing. The rinse covers the smell. The floss removes it.
When to Call
When Smelly Floss Is Worth an Appointment
The NHS puts it plainly: see a dentist if bad breath does not go away after treating it yourself for a few weeks, or if your gums are painful, bleeding or swollen. Floss that still smells after a few weeks of daily flossing falls into that first group.
At that point the real question is what is holding onto the plaque. It might be early gum disease, which our periodontal team treats, or a cavity or failing filling that a general dentistry exam will find. Neither one improves with more mouthwash.
If it has simply been a while since your last cleaning, that is the easiest place to start. Preventive care exists to catch this early, and Sampson Dental Group accepts most insurance plans. You can check yours here.
Three Offices
Cleanings in Gahanna, Powell and Westerville
Cleanings, periodontal care and the exam that settles the smelly-floss question are available at all three Sampson Dental Group offices around Columbus.
Gahanna, OH
156 Granville Street, Gahanna, OH 43230
Weekday appointments. Call for current hours.
Powell, OH
226 West Olentangy Street, Powell, OH 43065
Weekday appointments. Call for current hours.
Westerville, OH
135 Hoff Road, Suite B, Westerville, OH 43082
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More Questions About Smelly Floss
Why does my floss smell bad?
Because it is carrying plaque and trapped food that bacteria have been breaking down between your teeth. Cleveland Clinic attributes bad mouth odor to bacteria, and the NHS notes that flossing can reduce bad breath by removing plaque along the gum line. The smell is the plaque leaving.
Is it normal for floss to smell?
A faint smell now and then is normal, especially after skipping a day or two. A strong smell every time you floss, or a smell from one particular spot, is worth paying attention to. It usually means plaque or food is building up there faster than it is being removed.
Does smelly floss mean I have gum disease?
Not on its own. But the NHS lists both bad breath and gums that bleed when you brush or floss as symptoms of gum disease, so smelly floss together with bleeding is a good reason to book a checkup and cleaning.
Why does my floss only smell between certain teeth?
A single spot that smells every time usually has something holding onto food: a tight contact, a gap, the edge of an old filling, or a cavity. The NHS lists holes in teeth and infections among the causes of bad breath, so that tooth is worth having looked at.
Will mouthwash get rid of the smell?
For a little while. The American Dental Association says cosmetic mouthrinses may temporarily control bad breath, and that a mouthrinse does not take the place of brushing and flossing. It covers the smell, while flossing removes the source.
When should I see a dentist about smelly floss?
The NHS advises seeing a dentist if bad breath does not go away after a few weeks of treating it yourself, or if your gums are painful, bleeding or swollen. Any of the three Sampson Dental Group offices, in Gahanna, Powell or Westerville, can take a look.
Sources
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