Last updated 09.04.2026
What causes tonsil stones?
Learn how tonsil stones form, why some people get them more often, which symptoms they may cause and when to have recurring stones checked.
Have you noticed small white or yellow bumps in the back of your throat? Tonsil stones form when bacteria, dead cells and other material collect in small pockets in the tonsils and harden over time. They may be more likely to form in people with deep tonsil crypts or repeated tonsil inflammation and can cause bad breath, throat discomfort or trouble swallowing.
What you will learn in this article:
Tonsil stones form when bacteria and other material collect inside tonsil pockets.
Repeated tonsil inflammation may be linked with their formation.
Tonsil stones may cause bad breath, throat discomfort or trouble swallowing.
A dental provider can help you decide what to do if stones keep coming back.
If you have ongoing bad breath or throat discomfort, schedule an appointment with an Aspen Dental provider. Your dental provider can check for tonsil stones or other oral health concerns.
What are tonsil crypts?
Your tonsils are not smooth. They have small pockets and folds called crypts. Bacteria, dead cells and other material can collect inside these spaces.
How do tonsil stones actually form?
A review in the Journal of Surgical Case Reports explains that bacteria can gather inside enlarged tonsil crypts and form a layer called a biofilm. Over time, the trapped material may calcify, changing from a soft buildup into a hard stone.¹
Think of it like a small rock forming one layer at a time. The stone can contain bacteria, material from the mouth and minerals such as calcium.
Why do some people get them more than others?
Does tonsillitis play a role?
It may. The Journal of Surgical Case Reports review says tonsil stones are associated with repeated tonsil inflammation, including recurrent tonsillitis. However, an association does not prove that tonsillitis directly causes every stone.¹
If you often have tonsil infections, tell your dental provider or doctor. Your health history may help them understand what is happening.
Are there other possible causes?
Researchers have suggested a few other ways these stones may form. These include tonsil tissue growing in an unusual place, a blocked duct in a small saliva gland or an old abscess that becomes calcified.¹
The review presents these as possible explanations, not proven causes.
What happens if tonsil stones go untreated?
Tonsil stones do not always cause problems, but they can lead to symptoms that vary in type and severity.
Will they cause bad breath?
They can. The Journal of Surgical Case Reports review says bad breath linked with tonsil stones may come from sulfur-containing gases released by bacteria.¹
However, bad breath can have many causes. A dental provider can check your teeth and gums and help determine whether a tonsil stone or another oral health problem may be involved.
Can they get worse over time?
Large tonsil stones are rare. A Saudi Medical Journal case report described one man with a stone measuring 3.1 by 2.3 centimeters. He had a long history of sore throats, tonsillitis and snoring. The stone and his tonsils were removed. Because this was one unusual case, it does not show that every small stone will grow that large.²
Larger stones may cause trouble swallowing, a sore throat, ear pain or the feeling that something is stuck in your throat.
Is there a risk of infection?
The bacterial buildup in a tonsil stone may sometimes act as a focus for infection. That does not mean every stone will cause one.
Contact a dental provider or doctor if the area becomes red, swollen or painful, or if you develop a fever. These signs may need a closer look.
When should you see a dental provider?
A dental provider may notice a tonsil stone during an examination or on a dental X-ray. You do not need to wait until the area becomes painful. Talk with a dental provider or doctor if you notice:
Bad breath that does not improve with brushing
A visible white or yellow lump near your tonsils
A feeling that something is stuck in your throat
Throat soreness or trouble swallowing
Stones that keep coming back
If you notice recurring stones, trouble swallowing or ongoing throat discomfort, talk with your dental provider. They can check your mouth and let you know if you should also see a doctor or specialist.
What causes tonsil stones? FAQs
Still have questions about tonsil stones? These answers cover a few common concerns.
Can tonsil stones show up on dental X-rays?
Yes. A tonsil stone may appear by chance on a panoramic dental X-ray. Other structures and conditions can look similar, so the dental provider may need more information before confirming what it is.
Do small tonsil stones always need treatment?
Not always. Small stones that are not causing problems may need only monitoring. Ask a dental provider or doctor before trying to remove one yourself.
Do tonsil stones mean my tonsils need to come out?
Not usually. Treatment depends on the stone’s size, the symptoms it causes and whether it keeps coming back. Very large stones or stones linked with repeated tonsillitis may require care from a specialist. Tonsil removal is not the first step for everyone.
Sources
¹ National Institutes of Health, PubMed Central, Journal of Surgical Case Reports: “Giant tonsillolith – a rare cause of dysphagia.” https://pmc.ncbi.nlm.nih.gov/articles/PMC3649527/
² National Institutes of Health, PubMed Central, Saudi Medical Journal: “A giant tonsillolith.” https://pmc.ncbi.nlm.nih.gov/articles/PMC5938656/