Tonsil stones: what they are and how they form explained in 3D Tonsil stones, or tonsilloliths, are small, hard formations that develop in the crypts (lacunae) of the palatine tonsils. They are made of food particles, dead cells, bacteria, and other debris that accumulate and eventually calcify, creating solid white or yellowish deposits. Explore tonsil stone formation and removal in stunning 3D detail with VOKA 3D Anatomy & Pathology! 👇 Ever experienced tonsil stones? Let us know in the commen