Tackling Bad Breath
What produces the odour, the simple habits that fix most cases, how a hygiene visit helps, and the less common causes your GP should look into.
Why Does My Breath Smell, and What Will Fix It?
In nearly every case the odour starts inside the mouth, where bacteria thrive on the coated back of the tongue, in the spaces between teeth and below swollen gums. A daily habit of interdental and tongue cleaning, plenty to drink and treatment for any gum problem bring a clear improvement for most people within two or three weeks. If it persists, a visit to Fiona Dyer, our hygienist in Lanark, from £70, reaches the build-up that home care can't.
What Actually Causes the Odour
Bad breath is a matter of chemistry. Mouth bacteria break down leftover food, dead cells from the lining of the mouth and proteins carried in saliva, and as they do so they release sulphur compounds. Those gases are what people pick up on, a smell somewhere between bad eggs and overcooked cabbage.
The worst offenders prefer spots that are short of oxygen and rarely disturbed: the furry coating towards the back of the tongue, the tight contacts between molars, the margin of an ageing filling or crown, and the pockets that form around inflamed gums. Saliva normally keeps them in check by rinsing every surface. Overnight, or when you haven't drunk enough, the flow drops and they multiply, so breath first thing in the morning is usually the strongest of the day.
How to Tell If Your Breath Smells
Your nose adapts to your own breath, so you can't judge it reliably, and breathing into your hand reveals almost nothing. These tests are more honest:
- Lick the back of your wrist, wait ten seconds for it to dry and sniff
- Draw a clean teaspoon lightly across the rear of your tongue, then smell the spoon
- Floss between two molars and smell the thread
- Ask someone you trust for a frank answer: a partner, a friend, or any teenager at home
Other clues point the same way: a bad taste that won't shift, a pale or yellowish layer on the tongue, and gums that bleed when you clean. Some people are convinced their breath is bad when it isn't. If Fiona examines your mouth and finds it healthy, she will say so plainly.
Still Worried About Your Breath?
See Fiona Dyer, our hygienist, for a hygiene visit in Lanark.
Common Causes and How to Spot Them
| Cause | What you notice | What usually helps |
|---|---|---|
| Coated tongue | A pale or yellow layer towards the back | Cleaning the tongue every day with a scraper or brush |
| Plaque in the gaps | The floss smells once it's pulled through | Floss or interdental brushes daily |
| Gum disease | Bleeding on brushing and a taste that lingers | A hygiene visit, followed by gum treatment if it's needed |
| Dry mouth | Strongest on waking; linked to mouth breathing or some medicines | Regular sips of water, sugar-free gum, a review of your tablets |
| Trapped food | Smell or taste from one particular place | Fixing the cavity, broken filling or crown |
| Dentures, retainers and aligners | The appliance has its own odour | Daily cleaning, with dentures left out at night |
| Smoking or vaping | Always there, along with a dry mouth | Quitting, which helps your gums too |
| Strong foods and coffee | Follows meals, then fades | Nothing: it clears within a day |
| Fasting or very low-carb eating | A sweet, fruity or acetone smell | Eating regularly; extra brushing won't change it |
Six Daily Habits That Fix Most Cases
- Start with the gaps. Every day, ideally at bedtime, clean between your teeth with interdental brushes where they fit and floss where they won't. If you only change one thing, change this.
- Brush for a full two minutes each morning and night with fluoride toothpaste, angling the bristles towards the gum instead of scrubbing side to side.
- Clean the tongue. Go as far back as you comfortably can with a tongue scraper or your toothbrush and pull forward several times. A scraper handles the back of the tongue better, and what it lifts off is often an eye-opener.
- Spit, then leave it. Don't rinse after brushing, so the fluoride stays on your teeth.
- Keep saliva flowing. Drink water steadily through the day, chew sugar-free gum after eating, and don't skip breakfast, which kick-starts saliva.
- Clean your appliances. Dentures, retainers, aligners and gum shields collect the same film your teeth do. Brush them daily in cool water, and take dentures out overnight so your gums can rest.
Stick with it for two or three weeks before judging the result. If there's no difference by then, the cause is likely somewhere you can't reach, such as tartar under the gum or a hole in a tooth, and that's the point to book in with us.
When Gum Disease Is the Cause
When breath doesn't improve with better cleaning, gum inflammation is the reason we find most often. Plaque sitting at the gum margin turns to tartar within days. The gum swells, its seal around the tooth loosens and a shallow pocket develops. The bacteria that move into that pocket are the very ones that produce sulphur, and a brush can't reach them.
Signs to watch for include bleeding when you brush or floss, gums that look red, swollen or glossy, teeth that appear longer than they did, and a bad taste that returns soon after cleaning. At the early stage, called gingivitis, it clears with a professional clean and improved home care. Where bone loss has begun (periodontitis), Fiona treats it in stages with deep cleaning under the gum, at £100 per stage. 1 Read our gum disease guide for the full picture of symptoms and treatment.
How a Hygiene Visit Helps
A routine visit with Fiona Dyer, our hygienist in Lanark, lasts 30 minutes. She assesses the health of your gums, clears tartar both above and beneath the gum line, and can use Airflow, a fine spray of powder, air and warm water, to lift film and stains from around teeth, implants and brace brackets. She'll then show you exactly where bacteria are building up in your mouth and which interdental brush sizes suit your gaps.
A standard hygiene visit is £70, or £100 including Airflow. If there's a lot of build-up, a 60-minute deep clean, £130, deals with it in a single appointment. 1 Both of our dental plans include hygiene visits, so members have nothing to pay on the day. For most people, one appointment plus Fiona's advice for home is enough to solve the problem.
When the Mouth Isn't the Source
Occasionally the odour has nothing to do with teeth or gums. Possible sources elsewhere include:
- Nose and sinuses: sinus infections, and mucus running down the back of the throat, often worse with a cold
- Tonsils: small, pale tonsil stones that gather in the folds of the tonsils
- Stomach: acid reflux, particularly alongside heartburn
- Medicines: plenty of common tablets reduce saliva, among them some for blood pressure, depression, hay fever and an overactive bladder
- Blood sugar: a sweet, pear-drop smell can signal diabetes that isn't well controlled, and needs checking without delay
If we've examined your mouth and given it a clean bill of health, make a GP appointment and explain that a dentist has already ruled out your teeth and gums. That saves time and steers them towards the right tests.
Questions
This guide is general information, not a diagnosis. A dentist needs to examine you to say what is right for your teeth.