Why you should never ignore BAD BREATH – and how to cure it

It’s one of the most awkward problems patients bring into my clinic – and one they’ve often avoided for months, sometimes years.

Bad breath – or halitosis – isn’t just a minor nuisance you can laugh off with a mint. It chips away at confidence, strains relationships and can make people reluctant to speak at all.

And while many assume it’s harmless, it can sometimes signal something more serious going on beneath the surface. Yet despite all this, most people suffer in silence.

The truth is, bad breath can be surprisingly hard to detect yourself. In fact, it’s probably the one condition everyone else notices before you do.

The classic ‘cup your hands and sniff’ test might give you a rough idea, but it is far from reliable, and not something you want to be caught doing in public.

Some dentists use devices called halimeters, which measure volatile sulfur compounds – the gases responsible for that unpleasant smell – giving a much clearer and more objective answer.

From a GP’s perspective, halitosis is rarely just about poor brushing.

In fact, most people I see are already doing all the right things. They brush regularly, drink plenty of water, chew gum – and still the problem persists.

Many even reach for mouthwash constantly, hoping for a quick fix, but this can actually make things worse rather than better, which often comes as a surprise.

In most cases, the issue starts in the mouth.

Overnight, bacteria build up on the tongue, between the teeth and along the gums, releasing foul-smelling compounds.

This is why ‘morning breath’ is so common. Saliva normally keeps this bacteria build-up in check, but levels drop while we sleep, giving them the perfect opportunity to get to work. It is not laziness, it is biology.

Persistent bad breath, however, is often linked to gum disease. The tricky part is that early signs, such as bleeding gums, can be easy to miss or dismiss – but the bacteria involved can produce a strong, distinctive odour.

This is why regular dental check-ups are just as important as your daily routine, even if you think you are doing everything right.  

One of the first things I ask patients is how they brush, and many are surprised when I ask about their tongue. The tongue is one of the biggest sources of odour-causing bacteria, yet it is often completely ignored.

It is not smooth, but covered in tiny bumps that trap food, dead cells and microbes rather effectively. Cleaning it daily, ideally twice, can make a noticeable difference. It is not the most glamorous part of your routine, but it is one of the most important.

Hydration matters, too. A dry mouth allows bacteria to thrive, so drinking enough water is crucial.

It’s worth noting that not all bad breath begins in the mouth. As a GP, I am always looking for other causes. Dental infections such as abscesses can lead to pain, inflammation and odour, and need urgent attention.

Sinus infections can cause a foul smell from mucus collecting at the back of the throat. Tonsil stones, small debris-filled lumps, are another common and often overlooked culprit, and rarely a pleasant surprise for anyone involved.

There are also wider medical conditions to consider. Acid reflux can cause a sour smell, as stomach contents rise upwards. In rarer cases, bad breath can be linked to conditions such as diabetes or liver cirrhosis, where chemicals from the bloodstream are released via the lungs, creating distinctive odours. These are not the first causes we think of, but they are important not to miss.

What makes halitosis particularly distressing is its psychological impact. I have seen patients become deeply self-conscious, avoiding close conversations, keeping a polite distance or relying heavily on mints and sprays throughout the day.

These may offer a quick-fix, but they do not tackle the root of the problem. In fact, there’s evidence alcohol-based mouthwash can make things worse by drying the mouth (a condition known as xerostomia), reducing saliva and allowing odour-causing bacteria to flourish.

Decongestant nasal sprays and even some headache medications can have a similar drying effect, meaning that temporary relief can actually lead to worse breath over time. 

Treatment always depends on the cause. For many, improving oral hygiene does the trick. This includes brushing twice daily, flossing, cleaning the tongue and staying hydrated.

Newer options such as using liquid probiotic mouthwashes claim to introduce ‘good’ bacteria and rebalance the mouth’s ecosystem. They are generally safe to swallow, but their effectiveness may be limited because they do not stay in the mouth for long.

On the other hand, products containing chlorhexidine are very effective at killing odour-causing bacteria. But note, they also wipe out beneficial bacteria and are best used short-term or under dental guidance, rather than as a daily fix.

Lifestyle plays a role, too. The old wives’ tale of chewing parsley or mint can briefly freshen breath thanks to natural oils, but it simply masks the smell rather than solving the underlying issue.

Meanwhile, foods such as garlic and onions are well-known triggers, and while their effects are usually temporary, they can feel anything but in the moment.

Smoking and alcohol are bigger culprits, both contributing to dryness in the mouth and worsening the bad-breath problem.

What I always tell patients is this: bad breath is common, and in most cases, treatable, but it is not something to ignore. If it persists despite good oral hygiene, it is worth getting checked. A short consultation can often uncover the cause and point you towards the right treatment.

These conversations may start awkwardly in the clinic, often with a bit of hesitation and a nervous laugh, but they almost always end in relief.

Because once patients realise they are not alone, and that there is a solution, everything changes.

• Dr Arora is an NHS GP based in Surrey. 
• Instagram: @dr_rajarora; TikTok: @drrajarora