By Alexander Angeloff, founder of TranscenDental. We make xylitol mints, toothpaste and floss, so we have a stake in how you freshen your breath; we've tried to present the evidence fairly, including where it's thin. Educational content, not medical advice.
Bad breath is one of those problems people worry about more than they talk about. Mints and mouthwash cover it for half an hour, then it's back. The good news is that in most people the cause is in the mouth, and that means it's usually fixable at home.
The short answer: to get rid of bad breath, clean the places odor-causing bacteria live: brush twice a day, clean between your teeth daily, and gently clean your tongue, especially the back of it. Keep your mouth moist with water and sugar-free mints or gum, cut back on tobacco and alcohol, and see a dentist for a cleaning if you're due. If bad breath doesn't improve after a few weeks of good home care, see a dentist, and then a doctor if your mouth checks out, because gum disease, tonsil stones, reflux and some medical conditions can also cause it.
Made by TranscenDental
Where bad breath comes from
As Mayo Clinic puts it, "Most bad breath starts in your mouth" (Mayo Clinic). An expert consensus review estimated that about 90% of halitosis cases start inside the mouth rather than in the stomach or lungs (Renvert et al., 2020, Clinical, Cosmetic and Investigational Dentistry).
The smell itself comes mostly from gases called volatile sulfur compounds, chiefly hydrogen sulfide (the rotten-egg smell) and methyl mercaptan. Bacteria make them when they break down proteins from food debris, dead cells and saliva. They do this best in places with little oxygen and little cleaning:
- The back of the tongue. The same review calls tongue coating the main cause of bad breath that starts in the mouth. In one Belgian clinic study of 2,000 patients it cited, tongue coating alone explained 43% of the mouth-related cases.
- Between the teeth and under the gumline, where a toothbrush doesn't reach.
- Gum pockets. Gum disease can leave deep pockets that, in Mayo Clinic's words, "fill with odor-causing bacteria." In the Belgian study, gingivitis or periodontitis was the cause on its own in 11% of mouth-related cases, and combined with tongue coating in another 18%.
So the fix isn't a stronger mint. It's getting to the spots where those bacteria sit undisturbed.
How to tell if you have bad breath
It's hard to smell your own breath, because your nose gets used to it. The simplest checks: ask someone you trust to tell you honestly, or look at your tongue in the mirror. A thick white or yellowish coating toward the back is a common sign that your tongue is part of the problem. A dentist can also rate your breath directly and, as Mayo Clinic notes, may scrape the back of your tongue to check where the odor comes from.
Common causes and what to do about each
Most of these come from Mayo Clinic, Cleveland Clinic and the NHS (Cleveland Clinic; NHS).
| Cause | Clues | What to do |
|---|---|---|
| Plaque and food between teeth | Odor when you floss; worse after skipped brushing | Brush twice a day and clean between teeth daily |
| Tongue coating | White or yellow film at the back of the tongue | Clean your tongue gently once a day |
| Dry mouth | Worst in the morning; mouth breathing; certain medicines | Drink water, use sugar-free mints or gum, address the cause |
| Gum disease | Bleeding, swollen or receding gums; a bad taste that keeps coming back | Professional cleaning and better daily care |
| Strong foods | Garlic, onions, spices; lasts for hours | Brushing helps the mouth part; the rest passes as your body clears it |
| Smoking and tobacco | Constant tobacco smell; also dries the mouth | Quitting helps breath and gums |
| Tonsil stones, sinus or postnasal drip | Small white lumps in the tonsils; mucus in the throat | See a doctor or ENT if it keeps happening |
| Acid reflux (GERD) | Heartburn, sour taste | See your doctor |
| Medical conditions (less common) | A fruity smell can be a sign of diabetic ketoacidosis; kidney or liver disease can change breath odor | See a doctor, urgently if you feel unwell |
Morning breath
Almost everyone wakes up with some bad breath. Saliva helps rinse the mouth, and Mayo Clinic notes that dry mouth "naturally occurs during sleep." With less saliva overnight, bacteria have hours to work. Morning breath that clears after brushing and breakfast is normal. If yours is severe or you wake with a very dry mouth, see our guide to dry mouth at night.
How to get rid of bad breath: a daily routine
This is the boring part, and it's the part that works. It follows the NHS and Mayo Clinic self-care advice.
- Brush twice a day for two minutes. Use a soft brush and gentle pressure, angled toward the gumline. The NHS also suggests not rinsing with water straight after brushing, so the toothpaste stays on your teeth longer. Health authorities recommend a fluoride toothpaste; nano-hydroxyapatite is the main fluoride-free alternative (see hydroxyapatite vs fluoride).
- Clean between your teeth once a day. Floss or interdental brushes reach where food and plaque sit and rot. If your floss smells after a pass between two teeth, you've found a spot that needs regular attention.
- Clean your tongue once a day. Use a tongue scraper or your toothbrush, working from back to front with light strokes. The NHS says to do it gently; don't scrape hard enough to make your tongue sore or bleed.
- Keep your mouth moist. Drink water through the day. Mayo Clinic suggests chewing sugarless gum or sucking sugarless candy to get saliva flowing, and limiting caffeine, alcohol and tobacco, which dry the mouth.
- Clean dentures, retainers and mouthguards daily. The NHS advises taking dentures out at night and keeping them clean.
- Cut back on sugar. Frequent sugary snacks and drinks feed the bacteria behind both plaque and decay.
- Get regular check-ups and cleanings. Tartar and gum pockets can only be cleaned properly by a hygienist. If plaque is behind your breath, Cleveland Clinic notes it usually improves with a dental cleaning plus better home care.
Give it two to three weeks. If your gums bleed when you start flossing, that usually settles as the inflammation goes down; see bleeding gums when brushing.
My own routine is simple: I brush twice a day with a soft brush and spend extra time working the toothpaste along my gumline, I floss with bamboo floss, and I have a xylitol mint after meals. When I was formulating our products, a mint that was mostly xylitol mattered to me because, in my experience, xylitol draws a lot of saliva, at least as much as chewing gum does. That's my experience, not a study, but saliva is your mouth's natural rinse, so it's a sensible thing to encourage.
Made by TranscenDental
About 3g of organic birch xylitol per mint, with a postbiotic blend. Sugar-free, no gum base. Rich Ginger, Sweet Mint or GingerCinnaMint.
Quick fixes when you need fresh breath now
Sometimes you need a fix before a meeting or a date, not in three weeks. These help in the moment:
- Brush your tongue if you can get to a sink. It's often more effective than another mint because it removes some of the coating that produces the smell.
- Drink a glass of water and swish it around.
- Have a sugar-free mint or gum. The NHS suggests sugar-free mints or chewing gum after strong-smelling food and drinks. Look for xylitol near the top of the ingredient list; it doesn't feed the main cavity-causing bacterium the way sugar does.
- Eat something crunchy like an apple or carrot, which gets saliva going.
- Skip the coffee and alcohol if you can; both dry your mouth.
That's why we made Ora Flora xylitol mints almost entirely from organic birch xylitol, about 3 grams per mint, flavored with ginger, cinnamon or mint and a postbiotic lactobacillus blend, with no gum base or artificial sweeteners. They freshen breath; they don't treat halitosis or gum disease. Customers mostly talk about how their mouth feels. Christopher T. wrote: "Love the flavor. Leaves my mouth fresh." Rach B. put it this way: "These are perfect for an instant fresh breath, they are strong and fantastic." The ginger flavors are strong, so start with Sweet Mint if your mouth is sensitive, keep to two or three a day if you're new to xylitol, and keep all xylitol products away from dogs, for whom xylitol is toxic. More on dosing in is xylitol bad for you?
Mouthwash, tongue scrapers and probiotics: what the evidence says
A lot of products promise fresh breath. Here's an honest look at how well they're supported.
The big picture is weaker than the marketing. A 2019 Cochrane review pooled 44 randomized trials with 1,809 adults, covering mouthwashes, toothpastes, tongue cleaning, gum, tablets and more. Its conclusion: "We do not have enough evidence to say which intervention works better to control bad breath." The certainty of evidence was low to very low, mostly because trials were small and at risk of bias (Kumbargere Nagraj et al., 2019, Cochrane). That doesn't mean nothing works. It means the basics of cleaning are a safer bet than any single product.
| Approach | What research shows | Bottom line |
|---|---|---|
| Tongue cleaning | Reduced odor in two small trials (very low certainty); one review reports tongue cleaning can reduce sulfur compounds by up to 75% | Cheap, low risk, targets the main source. Worth doing daily. |
| Antibacterial mouthwash | Nearly all rinses with active ingredients reduced odor in a systematic review; chlorhexidine had the most evidence, and cetylpyridinium chloride plus zinc the best overall profile | Helpful as an add-on, not a substitute for cleaning. Chlorhexidine can stain teeth with long use. |
| Zinc | Zinc rinses are recommended as an add-on after mechanical cleaning, never alone | A useful ingredient, mostly studied in rinses |
| Probiotics | A 2022 meta-analysis of four trials (283 people) found no statistically significant effect | Promising idea, unproven. Don't rely on them. |
| Sugar-free gum or mints | Stimulate saliva; one trial of eucalyptus gum showed no clear odor benefit over placebo gum | Good for a quick refresh and dry mouth; masks more than it fixes |
Sources for the table: the Cochrane review above; a systematic review of mouthrinses (Blom et al., 2012, International Journal of Dental Hygiene); the expert consensus review (Renvert et al., 2020), which was funded by a company that sells a zinc and chlorhexidine rinse; and a probiotic meta-analysis (López-Valverde et al., 2022, Frontiers in Nutrition).
Choosing a mouthwash and toothpaste
As Cleveland Clinic notes, "Some mouthwashes only mask odors. Others fight the bacteria causing bad breath." If you use a rinse, pick one with an active antibacterial ingredient rather than just flavor. If your mouth tends to run dry, an alcohol-free rinse is gentler. Rinsing doesn't replace brushing, flossing and tongue cleaning, and the review authors stress mechanical cleaning first.
For toothpaste, a gentle formula you'll use twice a day matters more than a breath claim on the box. Some people find foaming detergents like SLS irritating, especially with a dry mouth; see SLS-free toothpaste. Our TranscenDental toothpaste has no SLS, uses 10% nano-hydroxyapatite and organic birch xylitol as its second ingredient, and includes zinc among its minerals, along with clove, rosemary and sage in a herbal ferment. We haven't tested it specifically for breath and don't claim it treats halitosis; it's a cosmetic toothpaste. If you're curious about traditional approaches, we also cover what the research says about oil pulling.
When to see a dentist or doctor
See a dentist if:
- Bad breath doesn't go away after a few weeks of good home care (the NHS threshold)
- Your gums are painful, bleeding or swollen, or your teeth feel loose
- You have toothache, a broken filling or problems with dentures
- You notice a bad taste that keeps coming back, or pus near a tooth
- You're overdue for a cleaning
If your dentist finds no cause in your mouth, Cleveland Clinic recommends seeing your primary care doctor. See a doctor sooner if bad breath comes with:
- Heartburn or a sour taste (possible reflux)
- Frequent sore throats, tonsil stones, or sinus problems
- A sweet or fruity smell with thirst, frequent urination, nausea or confusion; diabetic ketoacidosis is an emergency
- A very dry mouth that doesn't improve, especially if you take several medications
- Unexplained weight loss, a lump, or a sore in your mouth that doesn't heal
For more on how the bacteria in your mouth affect your whole body, see our guide to the oral microbiome.
Build the full routine: brush with TranscenDental toothpaste, clean between your teeth with plastic-free bamboo floss, and finish after meals with an Ora Flora xylitol mint. All three come together in the Oral Care Trio, which saves $12.
Frequently asked questions
How do I get rid of bad breath permanently?
Find and clean the source. For most people that means daily tongue cleaning, flossing, brushing twice a day and regular dental cleanings, plus treating gum disease or dry mouth if you have them. If it persists after a few weeks, see a dentist and then a doctor.
Why do I have bad breath even after brushing?
Brushing your teeth misses the back of your tongue, the spaces between teeth and gum pockets, which is where most odor comes from. Dry mouth, tonsil stones and reflux can also cause bad breath that brushing doesn't touch.
Does tongue scraping help bad breath?
Probably, yes. The back of the tongue is the most common source, and small studies show tongue cleaning reduces odor, though the evidence is low certainty. A scraper or a toothbrush both work if you're gentle.
What is the best mouthwash for bad breath?
Rinses with active antibacterial ingredients such as chlorhexidine or cetylpyridinium chloride with zinc have the most research behind them. Rinses that are only flavor mask odor briefly. Use any mouthwash as an add-on to cleaning, not a replacement.
Can bad breath come from your stomach?
Sometimes, for example with acid reflux, but it's much less common than people think. Most bad breath, around 90% by one estimate, starts in the mouth. If your mouth is clean and healthy and the smell persists, ask your doctor about reflux.
Do xylitol mints help bad breath?
They freshen breath and get saliva flowing, which helps when your mouth is dry. They won't fix the underlying cause on their own, so use them alongside brushing, flossing and tongue cleaning.
Is bad breath a sign of gum disease?
It can be. Bad breath or a bad taste that keeps returning, especially with bleeding or swollen gums, is a common sign of gum disease. A dentist can check for gum pockets and clean them.
Made by TranscenDental
About 3g of organic birch xylitol per mint, with a postbiotic blend. Sugar-free, no gum base. Rich Ginger, Sweet Mint or GingerCinnaMint.
