When it comes to bad breath, a lot gets masked and little gets explained. Yet the connection is well researched – and it leads to a place most people don’t think about in their oral care.

The tongue, not the teeth

By far the largest share of bad breath originates in the mouth itself, and there mostly on the back third of the tongue. The surface of the tongue isn’t smooth; it’s covered in papillae – a landscape of grooves where food residue, dead cells and coating collect.

In this coating, bacteria break down proteins. This produces sulphur-containing compounds. Those are exactly what you smell. It also explains why someone with well-cared-for teeth can still have bad breath: if you only brush your teeth, you skip the place where it starts.

What a mouthwash can do

A mouthwash provides fresh breath and a clean feeling in your mouth – a good addition to your daily routine. Because the smell usually develops in the coating on the tongue, it works best together with thorough brushing and a clean tongue.

This includes one unspectacular step: clean your tongue once a day. With a tongue cleaner, from back to front, without pressure. It takes twenty seconds.

When your mouth is dry, it smells stronger

Saliva rinses continuously. Where less saliva flows, more residue stays behind and bacteria have better conditions. That’s why morning breath is normal – saliva flow drops at night. And that’s why anything that dries out your mouth amplifies the effect: mouth breathing, caffeine, alcohol, smoking, some medicines.

If you’re dealing with a dry mouth on a regular basis, you’ll find the connections explained in Dry mouth and the oral mucosa.

What food has to do with it

Garlic and onions are a special case. Their sulphur compounds pass from the gut into the blood and are breathed out again via the lungs. Nothing in the mouth helps against this route – no brushing, no rinsing. It passes once your body has broken them down.

Coffee and protein-rich food are different: both leave residue and dryness in the mouth and so work via the usual route.

When it’s no longer the tongue

If the smell persists despite thorough tongue and tooth care, it’s worth a visit to the dentist. Common causes there are inflamed gums, gum pockets or leaking fillings and crowns. If it isn’t the mouth, the tonsils, sinuses or the gastrointestinal tract may be involved – then it’s a case for your GP.

Important and rarely said: your own perception isn’t much use here. You can’t reliably smell yourself. If you’re unsure, ask someone you trust, or have it assessed by a dentist.

What remains

Clean your tongue daily, drink enough, don’t skip the spaces between your teeth, and if the smell persists, look for the cause rather than masking it. You’ll find what you need for your daily care in the overview Tooth powder with hydroxyapatite.

Dentafari Starter Set – 100 g tooth powder refill with hydroxyapatite and amber glass jar
For your daily care
Hydroxyapatite Tooth Powder – Starter Set with Amber Glass Jar

One flavour of your choice together with the amber glass jar and aluminium screw lid. The jar stays; you refill it with the refill pouch. Mineral · With plant-based ingredients · Refillable · Tooth powder made in Germany.

How tooth powder works in principle is explained in Hydroxyapatite in oral care.

Your questions about bad breath

Where does bad breath usually come from?
In around nine out of ten cases, it originates in the mouth itself, most often on the back of the tongue. Coating collects there, in which bacteria form sulphur-containing compounds – and those smell.

Does mouthwash help?
It provides fresh breath and is a good addition to your routine. It works best together with thorough brushing and cleaning your tongue, because that’s where the smell usually develops.

How do I clean my tongue properly?
With a tongue cleaner from back to front, in calm strokes, once a day. No pressure, no scrubbing. A toothbrush works too, but is less thorough.

When should I see a dentist about it?
If the smell persists despite thorough tongue and tooth care. Then the cause often lies elsewhere – in the gums, a leaking filling, the tonsils, the nose or the gastrointestinal tract.

Your new oral care starts here.

Start with the Starter Set: one flavour of your choice and the amber glass jar that stays. Mineral · With plant-based ingredients · Refillable · Tooth powder made in Germany.

Shop the Starter Set →