For most people it's normal: saliva drops while you sleep, so bacteria get to work undisturbed, and the smell goes once you brush and have something to eat and drink. What deserves attention is a smell that stays all day despite brushing. That one has a cause, usually in the mouth itself.
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Because there's less saliva while you sleep. It happens to most people, not just you, and it doesn't mean you're not clean.
During the day, saliva is busy: it rinses your mouth, washes away bits of food and keeps bacteria in check. While you sleep it slows right down, so the bacteria on your tongue and between your teeth are left alone for hours, and they give off gases that don't smell good. That's what you notice in the morning.
It's stronger when your mouth dries out more: if you sleep with your mouth open, if you snore, or if your nose is blocked. And it's stronger if you go to bed with food caught between your teeth.
Because saliva gets going again as soon as you're up, talking, eating and drinking, and brushing clears what built up overnight. So if the smell has gone after brushing and breakfast, that's ordinary morning breath, and on its own it's nothing to worry about.
Clean the places where bacteria live before you sleep, and keep your mouth moist. Nothing gets rid of morning breath completely, because saliva will drop while you sleep anyway, but these steps cut down what builds up overnight:
Clean your tongueThe white or yellow coating at the back of the tongue is where most of the odour-causing bacteria gather. Clean it with your toothbrush or a tongue cleaner, from back to front, gently, never hard enough to hurt. And if there's a white patch that doesn't come off when you clean, or a sore in your mouth that hasn't healed within three weeks, that needs an examination, not cleaning.
Brush before bed, not just in the morningThe bedtime brush is the one that makes a difference to morning breath, because it clears food and plaque before hours of sleep. Use a soft brush and a fluoride toothpaste, paying attention to the gum line.
Floss once a day, ideally at nightBetween the teeth is where the brush can't reach, and food left there all night causes a smell. If your gums bleed for the first few days, keep going gently: that's the inflammation, not the floss, and it usually eases as you keep going. If it hasn't after two weeks, see “When is it worth an examination?” below.
A glass of water before bed, and one when you wake upWater doesn't treat the smell, but it keeps your mouth moister, and a moist mouth smells milder than a dry one. The first glass in the morning rinses away what built up overnight.
If you can, sleep with your mouth closedSleeping with your mouth open dries it out more. And if your nose is blocked most nights, or you snore a lot, mention it to your GP.
Dentures or a retainer? Clean them every dayJust like your teeth, because bacteria stick to them and cause a smell. How to clean it, and whether it stays in overnight, depends on the type, and it's something to go over at your examination.
They ease the smell for a few hours, but they don't remove the cause. Mouthwash doesn't remove tartar or food stuck between your teeth, so if the smell comes back every time it wears off, that's a sign the cause is still there. Sugarless gum gets your saliva flowing a little, but it doesn't treat anything either. Any rinse for your case is the doctor's decision.
Then there's a cause, and most of the time it's in the mouth itself rather than the stomach or anywhere else. These are the causes that come up most often:
| Cause | What you might notice | What usually happens |
|---|---|---|
| A coated tongue | A white or yellow coating at the back of your tongue, and the smell eases when you clean it | Cleaning your tongue every day at home |
| Inflamed gums or tartar | Gums that bleed when you brush, or look red and swollen | A cleaning at the clinic removes the tartar, along with proper care at home |
| Decay or a broken filling | Food catching in the same spot every time, or a hole you can feel with your tongue | It shows up at the examination, and the earlier it's caught, the simpler it usually is |
| A half-erupted wisdom tooth | The gum over it gets inflamed and sometimes sore, with a bad taste at the back of your mouth | The doctor checks it at the examination, with an X-ray if needed, and tells you what it needs and why |
Sometimes the cause is outside the teeth: the sinuses, the tonsils, the stomach, or a dry mouth from a medicine you take. An article can't tell you which, and the examination starts with your mouth. Mention any medicine you take, and don't stop any of them on your own.
When the smell stays all day after two weeks of proper care at home: brushing twice a day, cleaning your tongue, and flossing. And don't wait if it comes with one of these signs:
Most of the time, the first thing checked is your gums and tartar. The Gum inflammation, bleeding and recession page explains what the signs mean and how the inflammation is treated. And if you want to know what you can do at home, and where that stops: Inflamed gums? What helps at home, and when you need an examination.
You say it in one sentence, and the doctor takes it from there. “My breath doesn't smell good” is enough.
Bad breath is one of those things a lot of people feel shy asking about, and that's completely normal. In the examination room it's talked about calmly, without any remark that makes you feel awkward.
You say when it startedWhen you first noticed it, whether it's only in the morning or all day, and whether it comes with bleeding or a bad taste. And if you take any medicine, mention that too.
The doctor examines your whole mouthYour gums and tartar, your teeth and fillings, your tongue, and your wisdom teeth. And if an X-ray is needed, the clinic has digital X-rays, which show what the eye can't see.
You hear what he found, before anything elseWhere the cause is, what it needs, and why, before any treatment starts. If it's tartar or the gums, you usually start with a cleaning, and the Teeth cleaning and tartar removal page walks you through it step by step.
And if the examination finds nothing in your mouthYou hear it plainly: the cause isn't your teeth, and the next step is your GP. We suggest only the treatment you need.
Yes, for most people, and it doesn't mean you're not clean. If it's gone after brushing and breakfast, that's ordinary morning breath. The smell worth an examination is one that stays all day despite care at home.
Saliva itself usually isn't the source. The smell comes from bacteria living at the back of the tongue, between the teeth, in tartar and inflamed gums, and in any decayed tooth where food gets caught. It gets stronger when there's less saliva: during sleep, when you're thirsty, or with a medicine that dries the mouth. Mention that to your doctor, but don't stop the medicine on your own. Small white bits that smell strong? Those usually don't come from your teeth: mention them to your GP.
Morning breath isn't serious, and it goes with brushing and breakfast. A smell that stays all day usually isn't urgent, but it's a sign that a cause is still there, so it's worth an examination if it lasts despite two weeks of care at home, or comes with bleeding gums that haven't eased, or a bad taste from one tooth. What doesn't wait: a fever with the pain or the swelling, swelling under the jaw, difficulty opening your mouth, or any swelling or fever if you have diabetes. That needs a call now. Swelling in the gum or the cheek, pus, or strong pain needs a call today. If the clinic is closed or you can't reach us: go to the nearest hospital emergency department. Don't wait. And if the swelling has reached your eye or your neck, or it becomes hard to swallow or breathe, that is a hospital emergency, not an appointment.
It's hard to tell at home, and most of the time the smell comes from the mouth itself, not the stomach. So the right order is to start with the mouth: a clean tongue, two weeks of brushing and flossing, and an examination of your gums and teeth. If the examination finds no cause in your mouth, the next step is your GP, who decides whether it's the stomach or something else.
For morning breath: brush, clean your tongue, have a glass of water, and eat breakfast. That's usually enough. Mouthwash and gum cover the smell for a few hours, but they don't remove the cause. The real fix is removing the cause: tartar, inflamed gums, or a tooth where food gets caught. There's no pill that takes the smell away on its own, and don't take an antibiotic on your own.
No. Rinsing with salt water can soothe your mouth and rinse it a little, but it doesn't remove tartar or food stuck between your teeth, so the smell comes back if the cause is still there.
No drink gets rid of it, and no herb either: anything that masks the smell only masks it for a short while. Water is what really helps, because it keeps your mouth moist and rinses it. Sugary drinks feed the bacteria, and coffee dries your mouth and leaves its own smell, so a glass of water afterwards makes a difference.
An examination of your gums and teeth, calmly and without embarrassment. And you hear from the doctor whether your breath has a cause in your mouth, and if it does, what it needs.
This is general information, not a diagnosis. The decision is made at the examination.
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