Best Mouthwash for Bad Breath (2026): 6 Options Compared
We compared the active ingredients, alcohol content, ADA Seal status and real cost of 6 popular mouthwashes, and checked what research says about mouthwash and bad breath.
Quick answer
The best mouthwash for bad breath depends on what's causing it and how your mouth feels. Some rinses kill odor-causing germs, some neutralize smelly sulfur gases and one is made for dry mouth. Based on the labels and US prices checked for this FitnessLifeZone comparison, here's our pick for each need:
CloSYS: alcohol-free, with chlorine dioxide (an ingredient that can neutralize smelly sulfur gases), and the only brand here whose fresh breath rinses carry the ADA Seal for helping reduce bad breath.
Crest Pro-Health Multi-Protection: alcohol-free, with CPC (an antibacterial ingredient) that also helps fight plaque and gingivitis.
Listerine Cool Mint Antiseptic: essential oils that kill germs causing bad breath. Contains 21.6% alcohol.
TheraBreath Fresh Breath: a non-burning rinse with sodium chlorite (an ingredient used in fresh-breath rinses), made specifically to fight bad breath.
SmartMouth Original: a zinc rinse that claims at least 12 hours of fresh breath per rinse.
Biotène Dry Mouth Oral Rinse: moisturizes a dry mouth, a common cause of bad breath. It isn't a germ-killing rinse.
Good to know: mouthwash helps most when it's added to brushing, flossing and cleaning your tongue. If bad breath doesn't go away, see a dentist.
Mouthwash for bad breath by the numbers
From the sources and labels used in this FitnessLifeZone comparison, October 2026.
- Listerine Cool Mint$0.29
- Crest Pro-Health$0.29
- CloSYS Ultra Sensitive$0.44
- Biotène Dry Mouth$0.44
- TheraBreath Fresh Breath$0.58
- SmartMouth Original$0.66
Does mouthwash help bad breath? What research says
Mouthwash can help reduce bad breath, especially when it targets the germs or the smelly gases behind it, but the evidence is limited. According to the American Dental Association (ADA), bad breath is usually caused by bacteria that naturally live in the mouth, though dry mouth, gum disease, smoking and some medical conditions can also play a part.2 Many of these bacteria release smelly sulfur gases.
According to a Cochrane review of 5 randomized trials with 293 adults, antibacterial mouthwashes such as chlorhexidine and cetylpyridinium chloride (CPC) may help reduce the bacteria on the tongue that cause bad breath, while ingredients such as chlorine dioxide and zinc can neutralize the smelly sulfur compounds. One rinse combining chlorhexidine, CPC and zinc worked better than a placebo, but also caused more staining of the teeth and tongue. The reviewers said the trials were small and that larger, longer studies are needed.1
In plain words: a mouthwash that only tastes minty may cover up bad breath for a short time. Rinses with active ingredients (like CPC, chlorine dioxide, zinc or essential oils) aim to deal with the germs or gases behind it. None of them replace brushing, flossing or a dentist.
What to look for in a mouthwash for bad breath
A good mouthwash for bad breath has an active ingredient that targets germs or odor, suits how your mouth feels, ideally carries the ADA Seal, matches any other problem you have (like gums or dry mouth) and fits your budget. The active ingredient matters most, because a rinse with only flavor mainly masks odor. Use these 5 checks to compare any mouthwash:
What it meansCPC, chlorine dioxide or sodium chlorite, zinc, or essential oils (like thymol and eucalyptol).
Why it mattersThese target the germs or smelly gases behind bad breath instead of just covering the smell.
What it meansSome rinses contain alcohol; many others are alcohol-free.
Why it mattersAlcohol-based rinses can sting. If you have a dry or sensitive mouth, an alcohol-free rinse is usually more comfortable.
What it meansThe American Dental Association's Seal of Acceptance for a specific claim, like "helps reduce bad breath."
Why it mattersIt means the ADA reviewed evidence that the product is safe and works for that claim.
What it meansGum health, dry mouth, sensitivity or whitening.
Why it mattersIf dry mouth or gum problems are behind your bad breath, a rinse made for that cause fits better.
What it meansThe bottle price divided by its size in fluid ounces.
Why it mattersBottle sizes differ a lot. Per ounce, the rinses here range from $0.29 to $0.66.
Best mouthwash for bad breath: comparison table
The 6 mouthwashes range from $0.29 to $0.66 per fluid ounce, and 5 of them are alcohol-free. They use different ways to fight bad breath: CPC, essential oils, chlorine dioxide, sodium chlorite and zinc, while Biotène moisturizes a dry mouth instead. For this FitnessLifeZone comparison, all details come from each product's label and US retail listings in October 2026. Prices can change.
| Mouthwash | Key ingredient | Alcohol | ADA Seal for bad breath | Price per oz |
|---|---|---|---|---|
| Listerine Cool Mint1 L (33.8 oz) · $9.69 | Essential oils | 21.6% | No | $0.29 |
| Crest Pro-Health16.9 oz · $4.95 | CPC 0.07% | Free | No | $0.29 |
| CloSYS Ultra Sensitive32 oz · $13.97 | Chlorine dioxide | Free | ✓ Yes | $0.44 |
| Biotène Dry Mouth16 oz · $6.99 | Moisturizers (xylitol, glycerin) | Free | No | $0.44 |
| TheraBreath Fresh Breath16 oz · $9.33 | Sodium chlorite | Free | No | $0.58 |
| SmartMouth Original16 oz · $10.59 | Zinc | Free | No | $0.66 |
Price per fluid ounce, rounded to the nearest cent, from one US retailer for each product. Sorted from lowest to highest. "No" in the ADA column means the product isn't listed with the ADA Seal for bad breath; some may hold the Seal for other claims.
The 6 mouthwashes for bad breath, one by one
All 6 are sold over the counter in the US, but they work in different ways and suit different mouths. CloSYS has the ADA Seal for bad breath, Crest and Listerine are the cheapest per ounce, TheraBreath and SmartMouth are alcohol-free rinses made for bad breath, and Biotène is made for dry mouth. Here are the label facts, pros and cons of each.
1. CloSYS Ultra Sensitive Mouthwash
Best overall for bad breath
An alcohol-free, unflavored rinse that comes with an optional flavor dropper. According to the ADA's listing, CloSYS Fresh Breath Rinses use stabilized chlorine dioxide and carry the ADA Seal of Acceptance for helping reduce bad breath, meaning the ADA reviewed evidence that they're safe and effective for that claim when used as directed. Look for the ADA Seal on the bottle you buy.3
- CloSYS Fresh Breath Rinses carry the ADA Seal for bad breath
- Alcohol-free and dye-free
- Unflavored, with an optional flavor dropper
- Some people may not like an unflavored rinse
2. Crest Pro-Health Multi-Protection
Best budget pick, also for gums
An alcohol-free rinse with 0.07% cetylpyridinium chloride (CPC), an antibacterial ingredient. The drug label lists it for preventing and reducing plaque and gingivitis, and the front label says it freshens breath. Adults and children 6 and up rinse with 20 ml for 30 seconds, twice a day.
- Cheapest per ounce here ($0.29), tied with Listerine
- Also helps with plaque and gingivitis
- Alcohol-free, so it doesn't have alcohol's burn
- Bad breath isn't listed under its official drug uses
3. Listerine Cool Mint Antiseptic
Classic germ-killing rinse
The classic antiseptic rinse, with four essential oils: eucalyptol (0.092%), menthol (0.042%), methyl salicylate (0.060%) and thymol (0.064%). The label says it kills germs that cause bad breath, plaque and gingivitis. Use 20 ml for 30 seconds, morning and night.
- Cheapest per ounce here ($0.29) in the 1-liter size
- Also targets plaque and gingivitis
- Contains 21.6% alcohol, which some people find stings
- Not the best choice if you have a dry or sensitive mouth
4. TheraBreath Fresh Breath Oral Rinse
Alcohol-free for sensitive mouths
An alcohol-free, "dentist formulated" rinse with sodium chlorite. Adults rinse and gargle with 10 ml for 90 seconds, twice a day after brushing, then wait 5 minutes before eating. The label says it fights bad breath for 24 hours when used twice daily.
- Alcohol-free and described as non-burning
- Made specifically for bad breath
- Costs about twice as much per ounce as Crest or Listerine
- Labeled for ages 12 and up only
5. SmartMouth Original Activated Mouthwash
Longest-lasting claim
An alcohol-free rinse that comes in two parts: you pour both solutions together to activate its zinc. The brand claims each rinse eliminates and prevents bad breath for at least 12 hours, and 24 hours with a morning and evening rinse.
- Zinc, which can neutralize smelly sulfur compounds
- Alcohol-free
- Most expensive per ounce here ($0.66)
- The 12-hour claim comes from the brand, not an independent review
6. Biotène Dry Mouth Oral Rinse
Best for dry mouth
A moisturizing, alcohol-free and sugar-free rinse with xylitol and glycerin. It's made to relieve dry mouth for up to 4 hours, and dry mouth is one of the causes of bad breath the ADA lists. Rinse with 15 ml up to 5 times a day (ages 12 and up).
- Made for dry mouth, a common cause of bad breath
- Gentle, alcohol-free and sugar-free
- Not an antibacterial rinse, so it won't kill odor-causing germs
Best mouthwash for your situation
Choose a mouthwash based on what's behind your bad breath and how your mouth feels. If you want a rinse the ADA has reviewed for bad breath, CloSYS is the pick. If you want the lowest price and help with plaque and gums, Crest Pro-Health fits (and if your gums bleed often, see a dentist). If your mouth often feels dry, Biotène targets that cause. The FitnessLifeZone quick chooser below sums it up:
| If you want… | Consider |
|---|---|
| A rinse with the ADA Seal for bad breath | CloSYS |
| The lowest price, plus help with gums | Crest Pro-Health Multi-Protection |
| A classic antiseptic and don't mind alcohol | Listerine Cool Mint |
| An alcohol-free rinse for a sensitive mouth | TheraBreath or CloSYS |
| The longest-lasting claim | SmartMouth Original |
| Relief for a dry mouth | Biotène Dry Mouth Oral Rinse |
Where to buy: all 6 mouthwashes are sold at most US drugstores and supermarkets, and in online stores. Prices vary by store and bottle size, so compare the price per ounce before you buy.
Mouthwash vs oral probiotics: what's the difference?
Mouthwash fights bad breath by killing germs or neutralizing smelly gases, while oral probiotics try to add friendly bacteria to the mouth. They work in different ways, so some people use both: mouthwash as part of their daily routine, and an oral probiotic as an extra. According to a 2022 review in BMJ Open, oral probiotics may reduce bad breath in the short term, but the evidence is still limited.4
- Mouthwash: works right away, costs about $0.29–$0.66 per ounce, and has a longer history of research on germ-killing ingredients.
- Oral probiotics: a tablet or lozenge that dissolves in the mouth; costs more per day; research is newer. A well-known early study tested the S. salivarius K12 strain on bad breath.5
We compared 5 oral probiotics, including ProDentim, in our best oral probiotics for bad breath guide.
Oral probiotic option
ProDentim is a strawberry-mint soft tablet with a 3.5 billion CFU probiotic blend, S. salivarius and inulin. It costs about $1.63 to $2.80 a day and comes with a 60-day money-back guarantee. According to its makers, it's sold only through its official website (affiliate link). It's an extra to try alongside your routine, not a replacement for mouthwash, brushing or a dentist.
Read our full ProDentim review or see the ProDentim price guide.
How to use mouthwash for bad breath
Use mouthwash after brushing and flossing, measure the amount on the label, swish for the time it says, and don't swallow it. Labels differ: most say 10–20 ml for 30 to 90 seconds, once or twice a day. Some, like TheraBreath, also ask you to wait a few minutes before eating. Follow your rinse's own directions:
- Brush and floss first. Mouthwash works best on a clean mouth.
- Measure the dose on the label. Usually 10–20 ml (about 2–4 teaspoons).
- Swish (and gargle if the label says). For the time on the label, usually 30 to 90 seconds.
- Spit it out; don't swallow. Keep mouthwash away from young children.
- Wait before eating if the label says. For example, TheraBreath asks you to wait 5 minutes.
When to see a dentist about bad breath
See a dentist if bad breath lasts even though you brush, floss and use mouthwash, or if it comes with bleeding gums, tooth pain or a dry mouth. According to the ADA, persistent bad breath can be a warning sign of gum disease, and regular checkups help your dentist spot problems like gum disease or dry mouth. If your mouth is healthy, your dentist may refer you to a doctor, as sinus problems or acid reflux can also cause it.2
Want to compare oral probiotics too?
If you'd like to add an oral probiotic to your mouthwash routine, our FitnessLifeZone guide compares 5 options, including ProDentim, by strains, CFU and cost per day. You can also read our full ProDentim review to see its pros, cons and price before you decide.
Mouthwash for bad breath: FAQ
These are the questions people ask most about mouthwash for bad breath, from which one works best and whether alcohol-free rinses are good enough to how long the fresh feeling lasts and when to see a dentist. Each answer is based on product labels, published research and the expert sources listed below.
What is the best mouthwash for bad breath?
It depends on the cause. CloSYS is the only brand of the 6 we compared whose fresh breath rinses carry the ADA Seal for helping reduce bad breath. Crest Pro-Health Multi-Protection is the best budget pick and also helps with gums, Listerine Cool Mint is a classic germ-killing rinse, TheraBreath is a gentle alcohol-free option, SmartMouth has the longest-lasting claim, and Biotène is best for dry mouth.
Does mouthwash really help bad breath?
It can help. According to a Cochrane review of 5 trials with 293 adults, antibacterial mouthwashes may help reduce the bacteria on the tongue that cause bad breath, and ingredients like chlorine dioxide and zinc can neutralize smelly sulfur compounds. The reviewers said the trials were small and more research is needed.
What is the best mouthwash for bad breath that dentists recommend?
Look for the ADA Seal of Acceptance, which means the American Dental Association reviewed evidence for a product's claim. Of the 6 mouthwashes we compared, CloSYS Fresh Breath Rinses carry the ADA Seal for helping reduce bad breath.
Is alcohol-free mouthwash good for bad breath?
Yes, alcohol-free rinses can work well because the active ingredient matters more than alcohol. CloSYS, Crest Pro-Health, TheraBreath and SmartMouth are all alcohol-free and made to fight germs or odor, and they're usually more comfortable for a sensitive or dry mouth.
What is the best mouthwash for bad breath and gums?
Crest Pro-Health Multi-Protection and Listerine Cool Mint Antiseptic are both labeled to help with plaque and gingivitis as well as bad breath. Crest is alcohol-free, while Listerine contains 21.6% alcohol. If your gums bleed often, see a dentist, as this can be a sign of gum disease.
What is the best mouthwash for bad breath and dry mouth?
Biotène Dry Mouth Oral Rinse is made to relieve dry mouth for up to 4 hours, and dry mouth is a common cause of bad breath. It doesn't kill germs, so some people also use an alcohol-free antibacterial rinse. Ask a dentist if dry mouth is ongoing.
How long does mouthwash keep breath fresh?
It depends on the product. TheraBreath's label says it fights bad breath for 24 hours when used twice daily, and SmartMouth claims at least 12 hours per rinse. These are brand claims; brushing, flossing and cleaning your tongue still matter.
Should I use mouthwash before or after brushing?
Most labels say to use mouthwash after brushing and flossing. Follow your product's directions for how much to use and how long to swish, and don't swallow it.
Is mouthwash better than oral probiotics for bad breath?
They work in different ways. Mouthwash kills germs or neutralizes smelly gases and has a longer history of research, while oral probiotics try to add friendly bacteria and may help in the short term. Some people use both, with mouthwash as part of their daily routine.
Can children use mouthwash?
Check the label. Crest Pro-Health is labeled for ages 6 and up with supervision under 12, while TheraBreath and Biotène are labeled for ages 12 and up. Keep mouthwash away from young children, who may swallow it.
When should I see a dentist about bad breath?
See a dentist if bad breath lasts even though you brush, floss and use mouthwash, or if it comes with bleeding gums, tooth pain or a dry mouth. According to the ADA, persistent bad breath can be a warning sign of gum disease.
Sources
The FitnessLifeZone Research Team used these sources for this comparison: a Cochrane systematic review on mouthwashes, expert guidance and the Seal of Acceptance from the American Dental Association, research on oral probiotics, and each product's label and US retail listing, checked in October 2026.
- Fedorowicz Z, et al. Mouthrinses for the treatment of halitosis. Cochrane Database of Systematic Reviews. 2008.
- American Dental Association (ADA), MouthHealthy. Bad Breath.
- American Dental Association. ADA Seal of Acceptance: CloSYS Fresh Breath Rinses.
- Huang N, et al. Efficacy of probiotics in the management of halitosis: a systematic review and meta-analysis. BMJ Open. 2022.
- Burton JP, Chilcott CN, Moore CJ, Speiser G, Tagg JR. A preliminary study of the effect of probiotic Streptococcus salivarius K12 on oral malodour parameters. Journal of Applied Microbiology. 2006;100(4):754–764.
- Product labels and prices: CloSYS (Walmart), Crest Pro-Health (Vitacost) and its drug label, Listerine Cool Mint (label, price), TheraBreath (Vitacost), SmartMouth (Pasteur Pharmacy) and Biotène (ShopRite), checked October 13, 2026.
This article is for information only and isn't medical or dental advice. Statements about ProDentim have not been evaluated by the Food and Drug Administration, and it is not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. Product details and prices are based on labels and US retail listings as of October 13, 2026, and may change. Brand names belong to their owners; we are not affiliated with CloSYS, Crest, Listerine, TheraBreath, SmartMouth or Biotène.