Tonsil stones are far more common than most people realise. When researchers in Seoul reviewed CT scans from 3,886 patients, about 30% had at least one, and half of the stones they measured were only 1 to 2 mm across (Kim and colleagues, Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology, 2018). Most never cause a problem. The ones people notice tend to be larger, visible at the back of the throat, or linked to a stubborn smell.
They start in the folds of the tonsils
Your tonsils are not smooth. Their surface is dotted with small pits and channels called crypts. Shed cells, mucus, food particles and bacteria can collect in these crypts, and when that material stays put it can slowly harden with calcium salts. The result is a pale yellow or white lump, usually gritty or soft and crumbly, sometimes called a tonsillolith.
Some people seem more prone to them than others. Deep crypts, larger tonsils and repeated bouts of tonsillitis are often mentioned as factors, and in the Korean CT study the stones became more common with age. Having one does not mean your mouth is unclean.
The smell comes from bacteria living inside the stone
When Japanese researchers analysed the bacteria in tonsil stones, they found anaerobic species such as Fusobacterium, Porphyromonas and Prevotella, groups associated with producing volatile sulfur compounds, the gases behind most bad breath (Tsuneishi and colleagues, Microbes and Infection, 2006). In a Brazilian study of 49 people with chronic tonsil problems and bad breath complaints, a stone was present in 75% of those whose breath tests were abnormal, compared with 6% of those whose results were normal (Rio and colleagues, British Dental Journal, 2008).
That explains why someone can brush and floss carefully and still notice an odour. Even so, tonsil stones are only one possible source. Bad breath far more often starts in the mouth itself, from a coated tongue, plaque along the gums or gum disease, so it makes sense to rule those out too. Our article on a white coated tongue looks at one of the most frequent culprits.
Gargling is the safest way to shift one
A warm salt water gargle is the first thing to try. It can loosen small stones and settle irritated tissue, and an alcohol-free mouth rinse is a reasonable alternative. A firm cough sometimes brings a stone up on its own.
If a stone is clearly visible and near the surface, some people press very lightly on the tissue beside it with a clean cotton bud until it pops out. That is as far as home removal should go. Tonsil tissue is soft and bleeds easily, so avoid fingernails, tweezers, toothpicks or anything sharp, and do not keep prodding at the same spot. A stone that will not come out with gentle pressure is best left alone, as some work loose with time.
Fewer stones form when the mouth stays clean and moist
Nothing guarantees you will never get another one, particularly if your tonsils have deep crypts. What helps is reducing the material that collects there:
- Brush twice a day with fluoride toothpaste and clean between your teeth daily.
- Clean the back of your tongue gently with a scraper or your brush.
- Drink water regularly through the day, since a dry mouth lets debris settle.
- Gargle with water or salt water after meals if you are prone to stones.
- Cut back on smoking and alcohol, which both dry the mouth.
Healthy gums are part of the same picture. If your gums bleed when you brush, our guide to bleeding gums explains what to do about it.
Some symptoms need a dentist or GP to take a look
Make an appointment if stones keep coming back or are large, if you have throat pain that does not settle, if swallowing is uncomfortable, or if bad breath continues despite good cleaning at home. A dentist can check the teeth, gums and tongue for other causes of odour, while a GP can examine the throat and refer you to an ear, nose and throat surgeon if needed.
For people with frequent, troublesome stones, an ENT surgeon may discuss treatments that reduce the depth of the crypts or, less often, removal of the tonsils. These are medical decisions made case by case, and most people never need them.
A lump, ulcer or swelling in the throat that is only on one side, or that has not healed or changed within 3 weeks, should always be examined rather than assumed to be a tonsil stone. Pain near the back teeth can also come from a partly erupted wisdom tooth, which our article on pericoronitis covers.
Common questions
Are tonsil stones dangerous?
Usually not. They are mostly a nuisance. Large stones, repeated stones or ones that cause pain or trouble swallowing are worth having checked.
Will mouthwash get rid of them?
A rinse can help loosen a stone and freshen breath for a while, but it does not stop new ones forming. It works best alongside brushing, tongue cleaning, gargling and drinking enough water.
Do I need my tonsils out?
Very few people do. Tonsillectomy is a decision made with a doctor, usually only when stones or infections are frequent and affecting daily life.
Getting your breath checked
If bad breath or a feeling of something caught in your throat is bothering you, a dental check-up is a sensible starting point. Our general dentistry team can look for causes in the mouth and suggest whether a visit to your GP is the next step. Visit our current deals page to book a check-up at Lumi Dental in Melrose Park.
