The biggest one they ever recorded weighed around 43g.He could also have tonsil stones that sit in the back of your mouth, towards your throat.
Those things are disgusting and stay lodged in back then, smell like shid (literally)... when I had braces and had all this other nonsense in my mouth, I started to have this problem. But it has gone away.
Gargling with water & vinegar is known to dissolve them since they are calcified debris to begin with.