How do you prevent bad breath while fasting?
Fasting breath mainly comes from reduced saliva and bacteria on the tongue. Brush with fluoride toothpaste after suhoor and before sleep, clean between your teeth at night, clean your tongue gently, and drink water steadily between iftar and suhoor. A miswak can help during the day. At Creative Arts in Dubai, breath that stays bad after Ramadan is checked for gum disease, decay or tartar.
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Why does your breath change while you fast?
Saliva is the mouth's own cleaning system. It washes away food and bacteria, neutralises acids and keeps the tongue surface moist. Eating, drinking and chewing all stimulate it. During a long fast, especially in the heat of a Dubai summer, saliva flow drops, the mouth dries and bacteria on the back of the tongue multiply. Those bacteria break down proteins and release sulphur-containing gases, which are the main source of the stale smell most people notice by mid-afternoon.
There is also a second source that brushing cannot fully reach. When the body has gone many hours without food it burns more fat for energy and produces ketones, some of which are breathed out and give a distinctive, slightly sweet or fruity smell. This comes from the lungs rather than the mouth, and it fades once you eat at iftar.
Knowing the difference is useful. Mouth odour responds to brushing, tongue cleaning and water. Breath that is unpleasant all the time, including when you are not fasting, usually has a dental cause worth checking; see bad breath.
What does a good Ramadan oral care routine look like?
A simple pattern that fits around the fast. Adjust it to your own times for suhoor, iftar and sleep.
| When | What to do | Why it helps |
|---|---|---|
| After suhoor | Brush for two minutes with fluoride toothpaste, clean your tongue, spit out the excess and do not rinse | Starts the fast with a clean mouth and fluoride left on the teeth |
| During the day | A miswak or a dry brush if you wish; avoid swallowing anything | Disturbs plaque and freshens the mouth without toothpaste |
| At iftar | Break the fast with water before sweet drinks; rinse with water after dates and desserts | Rehydrates the mouth and clears sugar from the teeth |
| Between iftar and suhoor | Drink water steadily rather than all at once; limit sweet drinks and constant snacking | Saliva needs fluid; repeated sugar keeps teeth under acid attack |
| Before sleep | Brush with fluoride toothpaste and clean between your teeth with floss or interdental brushes | Removes the day's plaque and food before the longest dry spell |
Whether to use toothpaste or a miswak during fasting hours is a personal and religious choice; see the section on brushing below.
When should you brush your teeth in Ramadan?
The two brushes that matter most are after suhoor and before you sleep. Use a toothpaste containing fluoride, brush for about two minutes, then spit out the excess without rinsing, so the fluoride stays on the teeth. The NHS recommends exactly this pattern, with adults using a toothpaste of at least 1,350 ppm fluoride. If you have just had something acidic, such as citrus juice, wait a little before brushing.
Many people also want to freshen their mouth during fasting hours. The OIC International Islamic Fiqh Academy's Resolution 93 lists cleaning the teeth with a toothbrush or miswak among things that do not invalidate the fast, provided nothing is swallowed. Some people prefer to use only a miswak or a dry brush in the daytime; how you apply this is a question for you and a qualified scholar. Our guide to whether dental treatment breaks the fast covers the resolution in more detail.
If your brushing technique could be better, Ramadan is a good time to fix it; see how to brush your teeth properly.
Is the miswak as good as a toothbrush?
The miswak, a chewing stick usually cut from the Salvadora persica (arak) tree, has been used for centuries and it does clean teeth. A 2022 systematic review and meta-analysis of small, short-term trials in adults found that miswak used on its own reduced plaque and gum inflammation to a level comparable with a toothbrush, and that miswak used in addition to toothbrushing gave a greater reduction than brushing alone.
Two points keep this in balance. First, the trials were small and short, so they say little about long-term outcomes. Second, a miswak does not deliver the fluoride dose of a fluoride toothpaste, and fluoride is what protects teeth against decay. The sensible approach is to use the miswak as a complement, during the day if you wish, while keeping fluoride toothpaste for the brushes after suhoor and before sleep.
Using a miswak well: trim the end and chew it gently until the fibres separate into soft bristles; brush along the gum line and the surfaces of each tooth, including the backs; cut off the used bristles regularly so a fresh end is always in use; rinse it after use and keep it clean and dry. Do not press hard at the gum line, which can irritate or wear the gum just as an over-hard toothbrush can.
Clean your tongue, gently
Most fasting odour comes from the back of the tongue. Once or twice a day, after suhoor and before sleep, use a tongue scraper or your toothbrush to clean from back to front with light strokes, then spit. Scrubbing hard only irritates the surface and does not clean it any better.
What should you eat and drink between iftar and suhoor?
- Water, spread through the evening. A large amount at iftar followed by nothing until suhoor leaves the mouth dry for longer. Small, regular glasses work better for saliva and for comfort the next day.
- Fewer sweet drinks and sticky sweets. Dates, luqaimat, sweetened juices and Ramadan syrups are part of the season. Enjoy them with meals rather than as a constant trickle through the night, and rinse with water afterwards. Every sugary snack gives plaque bacteria another round of acid.
- Go easy on strong coffee and tea at suhoor. They can leave the mouth drier during the day and add to staining; our guide to coffee, karak and shisha stains explains how to limit it.
- Watch the salt and spice at suhoor. Salty food increases thirst during the day; onion and garlic leave odours that linger.
- Fibrous foods help. Vegetables and fruit that need chewing stimulate saliva at the meals when you can eat.
If your mouth feels dry even when you are not fasting, that is worth mentioning to your dentist; dry mouth has causes such as medicines that need a different approach.
Does mouthwash help with fasting breath?
A mouthwash can freshen the mouth for a while, but it does not replace brushing, tongue cleaning and water. If you use one, choose an alcohol-free product, because alcohol can dry the mouth further, and use it at a different time from brushing, so it does not wash away the fluoride from your toothpaste. The International Islamic Fiqh Academy's Resolution 93 lists mouthwash among things that do not invalidate the fast provided nothing is swallowed; many people still prefer to keep it for the evening.
Tartar and stain make fasting breath worse. A professional cleaning before or after Ramadan removes what brushing cannot, with Guided Biofilm Therapy at Creative Arts in Jumeirah.
See teeth cleaningWhen is bad breath a sign of a dental problem, not fasting?
Fasting breath should improve within an hour or two of iftar. These signs point to something else:
- Bad breath or a bad taste that stays when you are eating normally, or after Ramadan ends.
- Gums that bleed when you brush, look swollen or have pulled back from the teeth.
- Food that keeps catching between two teeth; see food stuck between teeth.
- A broken filling, a cavity or an old crown with a dark edge where food and bacteria collect.
- A white or red patch, or an ulcer that has not healed within three weeks.
Tartar below the gum line and gum pockets hold bacteria that no amount of brushing at home will reach. A check-up and professional cleaning deal with that. If you are planning dental visits around the month, our guide to dental treatment in Ramadan explains what to book before, during and after the fast.