Best Mouthwash for Gum Disease, Bad Breath and Sensitivity

Walk down the oral care aisle in any supermarket and you will find dozens of mouthwashes, each promising different benefits. But which one do you actually need? And perhaps more importantly, are you using it at the right time? Here is an evidence-based guide to help you choose.

The Most Important Thing Most People Get Wrong

The single biggest mistake with mouthwash is using it straight after brushing. Most people do this without realising it is actually counterproductive.

This advice comes directly from the NHS and Public Health England's Delivering Better Oral Health guidelines. It applies to all mouthwashes, including fluoride ones. If you must rinse after brushing, a fluoride mouthwash is the least harmful option.

Looking for a dentist who can advise on your oral care routine? Search for available appointments near you.

Types of Mouthwash and What They Do

There are four main types of mouthwash, each designed for different purposes. The right one for you depends on your specific oral health needs.

Fluoride Mouthwash

Best for: Extra cavity protection, especially for people at higher risk of decay.

Fluoride mouthwashes (typically containing 225ppm or 0.05% sodium fluoride) help strengthen enamel and protect against decay. They are particularly useful for people who are prone to cavities, those with braces or other orthodontic appliances, dry mouth sufferers, and anyone whose dentist has flagged them as high-risk for decay. Used at a separate time from brushing, they provide an additional fluoride boost to your teeth.

Chlorhexidine Mouthwash (e.g. Corsodyl)

Best for: Short-term treatment of gum disease and after dental surgery.

Chlorhexidine is the gold standard antibacterial mouthwash and is often prescribed by dentists to treat gingivitis (early gum disease) or after procedures like extractions or deep cleans. It is highly effective at reducing plaque and bacterial load.

However, it is intended for short-term use only. Typically up to two weeks. Prolonged use can cause brown staining of the teeth, altered taste, and in rare cases, mouth irritation. It is available over the counter (Corsodyl is the best-known brand in the UK) but is best used on your dentist's recommendation.

CPC (Cetylpyridinium Chloride) Mouthwash

Best for: Daily antibacterial use, maintaining gum health long-term.

CPC-based mouthwashes offer a good balance of antibacterial effectiveness and everyday usability. They help reduce plaque bacteria and can contribute to healthier gums without the staining issues associated with chlorhexidine. Many mainstream mouthwashes contain CPC. Check the ingredients list. They are a sensible choice for daily use if you want something more active than a basic fluoride rinse.

Hydrogen Peroxide Mouthwash

Best for: Mild whitening and antibacterial effects.

Mouthwashes containing low concentrations of hydrogen peroxide (typically 1.5%) can help with mild surface stain removal and have some antibacterial properties. They are sometimes marketed as whitening mouthwashes. Results are modest compared to professional whitening treatments, and they should not be used long-term without guidance from your dentist, as overuse can cause soft tissue irritation.

Best Mouthwash for Gum Disease

If your gums bleed when you brush or you have been diagnosed with gum disease, mouthwash can help as part of a broader treatment plan. It will not cure gum disease on its own, but it can support recovery alongside professional cleaning and improved brushing technique.

• Short-term (1-2 weeks): Chlorhexidine (Corsodyl) after a professional clean to help gums heal
• Long-term daily use: A CPC-based mouthwash for ongoing plaque control
• Ongoing: Proper brushing, interdental cleaning, and regular hygienist visits remain far more important than any mouthwash

For more on gum recession and its causes, see our dedicated guide. If your gums are bleeding regularly, our article on bleeding gums myths is also worth reading.

Best Mouthwash for Bad Breath

Many mouthwashes mask bad breath temporarily with strong flavours but do not address the underlying cause. A CPC-based mouthwash is more effective than a simple cosmetic rinse because it targets the bacteria responsible for producing odour.

That said, chronic bad breath (halitosis) often has an underlying cause. Gum disease, poor tongue hygiene, dry mouth, or a medical condition can all be responsible. If your bad breath persists despite good oral hygiene, see your dentist.

Tongue scraping can also make a significant difference. The back of the tongue harbours bacteria that produce volatile sulphur compounds, which are the main culprits behind bad breath. A tongue scraper or even the back of your toothbrush used gently on the tongue surface can help.

Best Mouthwash for Sensitive Teeth

If you have sensitive teeth, a fluoride mouthwash can help strengthen vulnerable enamel and reduce sensitivity over time. Some mouthwashes are specifically formulated for sensitive teeth and contain potassium nitrate, which helps desensitise tooth nerves. Used alongside a sensitivity toothpaste, they can provide additional relief.

Best Mouthwash for Dry Mouth

Dry mouth (xerostomia) is a common side effect of many medications and can significantly increase your risk of tooth decay. If you suffer from dry mouth, avoid alcohol-containing mouthwashes, as they will make the problem worse.

Look for mouthwashes specifically designed for dry mouth. These often contain ingredients like xylitol, which stimulates saliva production, or artificial saliva substitutes that help keep your mouth moist. A fluoride mouthwash is also a good choice for dry mouth sufferers, as the extra fluoride helps protect teeth that are more vulnerable to decay due to reduced saliva.

Children and Mouthwash

Mouthwash is generally not recommended for children under the age of six, as they may not be able to rinse and spit reliably and could swallow it. For children aged six and over who are at high risk of decay, a fluoride mouthwash used at a different time from brushing (such as after school lunch) may be beneficial. Check with your dentist first.

Alcohol vs Alcohol-Free Mouthwash

Many traditional mouthwashes contain alcohol (ethanol) as a carrier for active ingredients and as an antiseptic. However, alcohol-free formulations are now widely available and are generally recommended by dentists.

Alcohol-containing mouthwashes can cause a burning sensation, dry out the mouth (which can worsen bad breath over time), and irritate the soft tissues. There is no evidence that alcohol-containing mouthwashes are more effective than alcohol-free versions. If you have dry mouth, mouth ulcers, or sensitivity, alcohol-free is the clear choice.

How to Use Mouthwash Correctly

Getting the most out of your mouthwash is about timing and technique. Here is the correct way to use it:

1. Use mouthwash at a separate time from brushing. After lunch or mid-afternoon works well.
2. Measure the recommended amount (usually 10-20ml, check the label).
3. Swish vigorously around your mouth for 30 seconds to one minute.
4. Spit it out. Do not swallow.
5. Avoid eating or drinking for at least 30 minutes after rinsing.

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