Over time, this debris accumulates in the tonsil crypts (those natural pockets and folds in your tonsils) and hardens into small, often foul-smelling formations.
The smell: The distinct odor comes from bacteria breaking down proteins and producing sulfur compounds. It’s the same chemistry behind bad breath—just concentrated into tiny pellets.
Size: Most are smaller than a pea, though they can occasionally grow larger. The largest recorded tonsil stone? About the size of a walnut. (Yes, really.)
Color: Usually white, off-white, or yellowish. Sometimes they appear grayish if they’ve been present for a while.
Why Do Tonsil Stones Form?
Not everyone gets tonsil stones. If you do, it’s usually because of one or more of these factors:
1. Tonsil Crypt Anatomy
Your tonsils aren’t smooth surfaces. They’re covered in crypts—natural folds and pockets that increase surface area to help trap pathogens. For some people, these crypts are simply deeper and more numerous, creating perfect little traps for debris.
2. Chronic Inflammation
Frequent tonsillitis or chronic inflammation can enlarge the crypts and create more surface irregularities, making stone formation more likely.